Although it's Thailand's second largest island, tourism development has only recently come to Koh Chang. But in just a few short years, many resorts and other tourist services have developed. Things can get very quiet here during the low season, from May to September, but the diving can be pretty good all year around.
The bulk of the dive sites are in amongst the small islands between Koh Chang and Koh Kut to the south. There are numerous sea mounts and reefs here with an abundance of marine life.