Than Sadet has a string of waterfalls down to the beach at Ao Thong Reng, and this is the best. Deang features a sequence of falls, a pool for swimming in and lots of rock-clambering opportunities. You may even find someone slumped in the main flow, cooling off on the rocks in the gush of the water. Look for the signs and note that things are not as impressive in the dry season (March to June).