A great break from the beach is a trip to this complex of caves in the centre of Koh Lanta Yai. The adventure begins when you descend through a small, indistinct hole in the rocks and enter the series of diverse caverns. Some sections are as large as church halls, others require you to squeeze through on hands and knees. Sights en route include impressive stalactites and stalagmites, bats and even a cavern pool that you can swim in.