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The ISO by Castle

3.5 star property
3.5-star beachfront resort with outdoor pool

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Photo gallery for The ISO by Castle

Outdoor pool
Beach House Suite (2nd floor, stair access only) | Balcony view
Beach House Suite (2nd floor, stair access only) | Beach/ocean view
One Bedroom Ocean View (2nd Floor, stair access only) | Private kitchenette
One Bedroom Ocean View (2nd Floor, stair access only) | Living room

Reviews

8.4 out of 10
Very good

Popular amenities

  • Bar
  • Air conditioning

Explore the area

View in a map
4-796 Kuhio Hwy, Kapaa, HI, 96746
  • Place, Waipouli Beach
    ‪3 min walk‬
  • Place, Coconut Marketplace
    ‪14 min walk‬
  • Place, Lae Nani Beach
    ‪3 min drive‬
  • Airport, Lihue, HI (LIH)
    ‪15 min drive‬

Room options

View all photos for Ocean View (1st - 3rd Upper Floors, stair access only

1 bedroom, laptop workspace, blackout drapes, Internet

Ocean View (1st - 3rd Upper Floors, stair access only

8.6 out of 10
Excellent
(63 reviews)
  • 27 sq m
  • Ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Ocean Front View (1st - 3rd Upper Floors, stair access only)

Ocean Front View (1st - 3rd Upper Floors, stair access only)

Ocean Front View (1st - 3rd Upper Floors, stair access only)

7.8 out of 10
Good
(30 reviews)
  • 27 sq m
  • Ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Deluxe Room, Ocean View (2nd Floor - stair access only)

Deluxe Room, Ocean View (2nd Floor - stair access only) | Living area

Deluxe Room, Ocean View (2nd Floor - stair access only)

7.8 out of 10
Good
(14 reviews)
  • 27 sq m
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Double Sofa Bed OR 2 Double Beds

View all photos for One Bedroom Ocean View (2nd Floor, stair access only)

One Bedroom Ocean View (2nd Floor, stair access only) | Private kitchenette

One Bedroom Ocean View (2nd Floor, stair access only)

9.0 out of 10
Wonderful
(2 reviews)
  • 54 sq m
  • 1 bedroom
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Double Sofa Bed

View all photos for Beach House Suite (2nd floor, stair access only)

Beach House Suite (2nd floor, stair access only) | Living area

Beach House Suite (2nd floor, stair access only)

10.0 out of 10
Exceptional
(1 review)
  • 59 sq m
  • 1 bedroom
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Queen Sofa Bed

View all photos for Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only)

Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only) | View from room

Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only)

9.4 out of 10
Exceptional
(6 reviews)
  • 27 sq m
  • Partial ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

10.0 out of 10
Exceptional
(1 review)
  • 27 sq m
  • Ocean view
  • Sleeps 3
  • 1 King Bed

About the area

Kapaa

On the beach.With a stay at this Waipouli resort, you'll be within half a mile (1 km) of Waipouli Beach and 2 miles (3 km) of Coconut Marketplace. Fuji Beach and Kapaa Shopping Center are also within 2 miles (3 km).
View more Resorts in KapaaOpens in a new window

What's nearby

  • Waipouli Beach - 3 min walk - 0.3 km
  • Coconut Marketplace - 14 min walk - 1.2 km
  • Lae Nani Beach - 3 min drive - 1.5 km
  • Kapa'a Beach Park - 4 min drive - 2.6 km
  • Smith's Tropical Paradise - 6 min drive - 3.0 km

Getting around

  • Lihue Airport (LIH) - 14 min drive

Restaurants

  • ‪McDonald's - ‬4 min walk
  • ‪Starbucks - ‬6 min walk
  • ‪Sensei Sushi Bar And Grill - ‬14 min walk
  • ‪JoJo’s Shave Ice - ‬15 min walk
  • ‪Waipouli Deli & Restaurant - ‬3 min walk

About this property

The ISO by Castle

3.5-star beachfront resort with outdoor pool
There's a restaurant on site. You can enjoy a drink at the bar/lounge. The ISO by Castle also features an outdoor pool, a garden, and a water dispenser.

This 3.5-star Kapaa resort is smoke free.

  • 78 guestrooms or units
  • 3 levels
  • 5 buildings
  • Front desk (limited hours)
  • Garden
  • No smoking on site
  • Water dispenser
  • Bar or lounge
  • Dining venue
The ISO by Castle offers 78 air-conditioned accommodations with complimentary toiletries and ceiling fans. Rooms open to balconies. 42-inch flat-screen televisions come with cable channels. Guests can make use of the in-room refrigerators and coffee/tea makers. Bathrooms include shower/tub combinations.

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Balcony
Aston Islander on the Beach
  • Pool
  • Air conditioning
  • Bar
  • Laundry
4.3 out of 5, Excellent, 1,023 reviews
The price is CA $299
CA $397 total
includes taxes & fees
Nov 3 - Nov 4
Aston Islander on the Beach

Property amenities

Family friendly

  • In-room refrigerator
  • Outdoor pool

Internet

  • Available in all rooms: High-speed internet

Food and drink

  • A bar/lounge
  • A restaurant

Things to do

  • Bicycle rentals
  • Outdoor pool
  • Snorkeling
  • Yoga classes

Accessibility

  • No elevator

Room amenities

Entertainment

  • 42-inch flat-screen TV with cable channels

Bedroom

  • Bedsheets provided
  • Blackout drapes

Bathroom

  • Free toiletries
  • Private bathroom
  • Shower/bathtub combination
  • Towels provided

Food and drink

  • Coffee/tea maker
  • Refrigerator

More

  • Air conditioning
  • Ceiling fan
  • Laptop workspace

Policies

Check-in

Check-in start time: 3:00 PM; Check-in end time: 10:00 PM
Minimum check-in age: 18

Check-out

Check-out before 11 AM
Late check-out subject to availability
A late check-out fee will be charged

Special check-in instructions

The front desk is open daily from 7:00 AM - 10:00 PM
Front desk staffed during limited hours

Access methods

Front desk (limited hours)

Pets

  • No pets allowed

Children and extra beds

  • Children are welcome.
  • Rollaway/extra beds are not available.

Property payment types

Important information

Fees

Guests will be asked to pay the following charges at the property:

  • Resort fee: USD 35.38 per accommodation, per night
The resort fee includes:
  • Additional inclusions
  • Fitness/yoga classes
  • Newspaper
  • Parking
  • Self parking
  • WiFi access (may be limited)

We've listed all charges provided to us by the property.

Optional extras

The fees and deposits listed below will be charged at the time of service, check-in, or check-out.

  • Late check-out is available for a fee (subject to availability)

This may not be a comprehensive list. Fees and deposits are subject to change and might not include tax.

You need to know

Extra-person charges may apply and vary depending on property policy
Government-issued photo identification and a credit card, debit card, or cash deposit may be required at check-in for incidental charges
Special requests are subject to availability upon check-in and may incur additional charges; special requests cannot be guaranteed
Tax ID - W-34434930-01
This property accepts credit cards and debit cards; cash is not accepted
Safety features at this property include a smoke detector
This property has outdoor spaces, such as balconies, patios, terraces which may not be suitable for children; if you have concerns, we recommend contacting the property prior to your arrival to confirm they can accommodate you in a suitable room
Charges for extra guests may apply and vary according to property policy.
A cash deposit, credit card, or debit card for incidental charges and government-issued photo identification may be required upon check-in.
Special requests are subject to availability at the time of check-in. Special requests can't be guaranteed and may incur additional charges.
    This property is managed by a professional host. The provision of housing is linked to their trade, business, or profession. This property has outdoor spaces, such as balconies, patios, terraces which may not be suitable for children. If you have concerns, we recommend contacting the property prior to your arrival to confirm they can accommodate you in a suitable room. The tax ID number is W-34434930-01. This property accepts Visa, Mastercard, American Express, Discover, and debit cards. Cash is not accepted. For guests' safety, the property includes a smoke detector in each accommodation.

We should mention

  • Registered guests are the only ones allowed to be in guestrooms.

Property is also known as

Castle Mokihana
Castle Mokihana Hotel
Castle Mokihana Hotel Kapaa
Castle Mokihana Kapaa
Mokihana Of Kauai Hotel Kapaa
ISO. Island. Sky. Ocean. Resort Kapaa
ISO. Island. Sky. Ocean. Resort
ISO. Island. Sky. Ocean. Kapaa
ISO. Island. Sky. Ocean.
ISO Sky Ocean Resort Kapaa
The ISO by Castle Kapaa
The ISO by Castle Resort
The ISO. Island. Sky. Ocean.
The ISO by Castle Resort Kapaa

Reviews

The ISO by Castle Reviews

8.4

Very good

8.8/10

Cleanliness

8.4/10

Staff & service

8.0/10

Amenities

8.2/10

Property conditions & facilities

8.4/10

Eco-friendliness
Rating 10 - Excellent. 481 out of 1002 reviews
Rating 8 - Good. 330 out of 1002 reviews
Rating 6 - Okay. 120 out of 1002 reviews
Rating 4 - Poor. 41 out of 1002 reviews
Rating 2 - Terrible. 30 out of 1002 reviews

Reviews

10/10 Excellent

Kiarah

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
Had a lot of amenities like a nice grab and go breakfast as well as bikes you could rent out. They also did morning yoga and had a great pool.
Stayed 2 nights in Jul 2025

6/10 Okay

Paul

Disliked: Property conditions & facilities

Location good hotel very average

Somewhat remodeled hotel, not a resort. Do not bring your kids no beach and beach swimming. Located on water but unable to swim due to rocks and break. AC needs upgrade and was there for three days and was offered no housekeeping service. Was handed towels and they never came to room to ask if I needed service. Very very poorly done. For the price I would look at other options.
Stayed 1 night in Jul 2025

8/10 Good

Paul

Liked: Cleanliness, staff & service
Great location nice restaurant attached to Hotel. No beach for swimming though but very nice location on the water. Nice pool very quiet location.
Stayed 2 nights in Jul 2025

10/10 Excellent

Raul

Stayed 6 nights in Jul 2025

10/10 Excellent

KIANAMALIA

Stayed 2 nights in Jul 2025

6/10 Okay

Malcolm

Liked: Staff & service
The property is just old and the rooms are very small for two non married people even though they had two beds. They try hard to keep it clean but remodeling is necessary. All in all it was a good stay
Stayed 14 nights in Jun 2025

8/10 Good

Donna

Travelled with partner
Liked: Cleanliness, amenities, property conditions & facilities
Great location, bikes were nice for the bike path, breakfast,grab and go was helpful.. property was older but well kept.
Stayed 4 nights in Jul 2025

10/10 Excellent

Antoinette

Stayed 4 nights in Jul 2025

10/10 Excellent

Steve

Travelled with group
Liked: Cleanliness, amenities, property conditions & facilities
Nothing to dislike like about the stay. Will recommend for friends for certain who want to visit Kauai. Experience was amazing, along with the staff.
Stayed 2 nights in Jul 2025

10/10 Excellent

DWARAKESH, FREMONT

Liked: Property conditions & facilities
Great views outside the balcony
Stayed 3 nights in Jun 2025

10/10 Excellent

Douglas

Liked: Cleanliness, amenities, property conditions & facilities
Stayed 2 nights in Jun 2025

8/10 Good

Clint Eric

Travelled with family
Liked: Amenities
The breakfast could use a few more selections and a coffee pot. The amenities were unique and nice! The bikes, morning yoga as well as the pool were nice to have! As well as the unique welcoming gifts. The cleanliness of the room was just okay. Noticed lots of dirt that was just missed as well as the room smelled of mildew.
Stayed 6 nights in Jun 2025

10/10 Excellent

Brian

Travelled with family, Travelled with partner
Liked: Cleanliness, staff & service, amenities, property conditions & facilities
The ISO is a great affordable option to some of the other overblown resorts in the area. Rooms are clean and comfortable, staff is helpful, and the hotel is conveniently located close to some great restaurants and island excursions. While it may not have the bells and whistles of nearby options, it has a pool, a great continental breakfast, and EVERY room is ocean-view.
Stayed 7 nights in Jun 2025

10/10 Excellent

Hayley

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Amazing place to stay in Kauai! 10/10 recommend. Friendly staff, prime location, beautiful grounds, clean rooms!
Stayed 3 nights in Jun 2025

10/10 Excellent

Leonor

Stayed 2 nights in Jun 2025

8/10 Good

Marcus

Travelled with partner
Liked: Cleanliness, staff & service
A little tired the property is, but with free bikes, a pool and great views to the beach- we were satisfied. Breakfast has some fresh fruit, sweet yogurt and bakery items. Staff were hit and miss (afternoon shift was lovely).
Stayed 3 nights in Jun 2025

6/10 Okay

Naziroh

Stayed 2 nights in Jun 2025

10/10 Excellent

Jezzamine

Stayed 5 nights in May 2025

8/10 Good

Onell

Travelled with family
Liked: Cleanliness, amenities, property conditions & facilities
It was ok. Shower didnr work wekl and couldn't get them to fix it. Continental breakfast was grab and go cold cereal, granola bars, yogurt etc. The pool waz nice
Stayed 5 nights in May 2025

8/10 Good

Maitland E

Liked: Cleanliness, amenities
Overall I enjoyed my stay. The views were gorgeous. Everything was clean. The pool was great and the beach access there was awesome. All the staff was lovely as well. There were just some maintenance that would really round out the entire experience.
Stayed 8 nights in May 2025

10/10 Excellent

Raymond, Bozeman

Stayed 1 night in May 2025

10/10 Excellent

Irvin

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
amazing view nice hotel
Stayed 4 nights in May 2025

10/10 Excellent

sophia

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
It was just what I needed. Cozy bed, ocean waves lull me to sleep, Bullshed great dinner and a hot shower. Awesome a R&R
Stayed 1 night in May 2025

10/10 Excellent

jeffrey

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort

beautiful view

everything at the hotel was perfect , except the breakfast.Too much sugar items
Stayed 8 nights in May 2025

10/10 Excellent

Kyle

Liked: Cleanliness, staff & service, property conditions & facilities
Our stay was great! The ISO is in a great location within walking distance to several beaches and food options.
Stayed 2 nights in May 2025