Above are the dates of the legendary full moon part of Koh Phangan. For a guide to the Full moon parties please click here. These are possible the largest and greatest parties in south east Asia and are certainly worth the travel to Koh Phangan to experience. Koh Phangan is a relaxed island for 3 weeks in a month but during the build up week the island suddenly becomes packed – well pack for Koh Phangan. During this time hotel prices become more expensive and it may also be necessary to pre-book hotel rooms which is almost unheard of in Thailand.