Tham Sai information
Lonely Planet review
Sitting at the end of a 280m hillside trail, Tham Sai features a large single cavern filled with stalactites and stalagmites. Be careful of steep drop-offs inside and slippery footings. Usually, only more adventurous types undertake this one. Villagers rent out lamps near the cave mouth. It is just north of Hat Sam Phraya.