Boat riding to reach through Sohoton Cave, the sole entrance that leads to an enormous labyrinth of a lagoon. There are many nooks and crannies to explore. If you are that adventurous, you can swim with your guide through an underwater tunnel which leads to a hidden cave.
You'll also find stingless jellyfish here in one of the lagoon's "pools", similar to Palau's Jellyfish Lake. If the sun is too hot, you can paddle under the rainforest canopy between limestone stalactites. Watch out for eagles, sea hawks, hornbills, giant fruit-eating bats, and other rare and exotic species.