KOH MOOK. ave. ocean temp. is 28C ! The diving is wonderful- very often Manta Rays are spotted ! Amazing snorkeling. Morakot Cave is located at Koh Mook, hidden in the jungle, among the cliffs is the awesome Morakot Cave. The cave entrance is a small passage on the islands western side that is accessible by boat during low tide. The cave itself winds for about 80 meters to the other exit, opening onto a clean white beach with an emerald color open pool which is surrounded by high cliffs.