Hit the slopes at Wanlong Ski Area during your trip to Chongli County.
You can learn about the history of Zhangbei County with a stop at Zhongdu of Yuan Dynasty Sites. While you're in the area, wander around the natural setting.
You can learn about the history of Zhangjiakou when you stop by Dajing Gate. Amble around the area's parks or experience its entertainment venues.