You can learn about the history of Mae Sai with a trip to Wild Boars Academy Team View Point. Wander the waterfront and gardens while you're in the area.
If you're planning a bit of sightseeing during your trip, head to Wat Phra That Doi Tung Viewpoint— just one of the landmarks located 2.9 mi (4.7 km) from central Huai Khrai.