One of my favorite National Park in Northern Thailand..
Huay Nam Dang National Park (30 kms before Pai from Mae Taeng) has an entrance after the Mae Sae village and joins Muang Khong village in Chiang Dao National Park..

Healthy, good air, camp-sites, nature-trails by bikes, tours, trekkings, several tribal villages, coffee, oranges and all kinds of plantations. Nice and friendly people in the tribal villages.