LANG KHAI BAY (KOH TAO THAILAND ISLAND)
This area consists of two bays, Lang Khai Bay itself and the other smaller Lad Bay. and these form one of the best hidden and less known snorkelling points. Lang Khai Bay has its amall beach in front of a valley in between 2 high hills. There are several large boulders covered with various kinds of unspoiled new and older corals, both soft and hard. The best snorkelling point is on the north side, with the steeper sea floor at a depth of 5-10 metres.
At Lad Bay, there is a single resort at the end of the road built on the cliff and providing and easy walkway down to a very beautiful snorkelling point: King kong Rock.....Koh Tao Perfect blog