We decided to go on a trip of 4 islands while on Koh Lanta. We did some snorkelling on the badly bleached reefs but the best part was visiting Emerald Cave on Ko Mook. The cave entrance is a small passage on the island's western side that is accessible only 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. We followed our guide and swam through the cave, at one point in complete darkness, until we reached the lagoon which was stunning except it was full of tourists! That seems to be the way it is in Thailand though, very few places are undiscovered by mass tourism. Nevertheless it was beautiful and we spent some time inside before making our way back out of the cave trying to follow the guide's torchlight through the darkness.
Everywhere you look limestone cliffs shoot out of the ocean