text: [{"text_idx": "#000117", "text": "Koh Tao is a 21 square kilometre island in the Gulf of Thailand to the north of the larger Koh Samui and Koh Phangan islands. Koh Tao is a very busy island with people coming to take some of the cheapest diving courses in the world and to go snorkelling. One of the reasons why the diving is cheap in Koh Tao, and its good for snorkelling as well, is that there are plenty of sites a short distance from the coast of the island. This cuts down on fuel costs. However, if you are planning to learn how to dive then remember that the competition to offer cheap courses has had the effect of driving down standards and some of the instruction offered on the island is sub-standard as a consequence."}, {"text_idx": "#000118", "text": "Koh Tao is best known for its diving and snorkelling"}]