A few years ago, a group of tourists and the owner of Paradise Bungalow found that the most beautiful moon was in Koh Phangan. They arranged a party along the crescent-shaped beach of Haad Rin to celebrate the Full Moon night. From then on, people from all over the world came to join the celebration. And now there are 7,000-10,000 people at the party each month. Check the link for the Full Moon Party for more information and dates.
Unfortunately, we weren't there for the party, but attended the Black Moon Party. The Black Moon Party attracts over 1,500 people. It takes place 2 weeks before and 2 weeks after each full moon. This party is decorated with fluorescent lights and hosts resident DJs playing drum and bass. Also, very fun!