Not quite unseen.
It should be avoided on holidays. It is popular with locals. But Thong Pha Phum National Park in Kanchanaburi is one of the last unspoilt areas in Thailand.
Generally overlooked by the commercially driven tour companies it offers a world of caves, waterfalls, tin mines, and vast tracts of jungle stretching into Burma.
Together with neighboring Thung Yai Naresuan, Hua Kha Khaeng, Mae Wong, and Umphang wildlife sanctuary’s, this area makes up one of the most important conservation areas in South East Asia.
There is a big camp site as well as chalets which are well worn. But still comfortable.There is also an option to book a tree house.
The road continues up, onto Pilok which used to be a thriving Tin and Tungstan mining area. Ban I-Thong on the Burmese border is a sleepy village with some interesting coffee shops which becomes bedlam when it is invaded by tourists over holiday periods.
thailandadventureguide.com