Pangmapha, also known as Soppong, is a small town with a predominantly hill tribe population on the road between Pai and Mae Hong Son. Pangmapha is less touristic, and has a more traditional feel than Pai. The village is a trading and market centre for the many hilltribe villages that populate the area. You can visit Tham Lot cave features the largest cave opening in SE Asia with a river passing through the cave that can be explored with local guides on bamboo rafts.
(http://wikitravel.org/en/Pangmapha)