Haad Rin is a peninsular beach area and town on the south-eastern tip of Ko Pha Ngan, an island in the Gulf of Thailand. Its two main beaches are Sunset Beach (Haad Rin Nai) to the south and the larger with 1 1/2 kilometers cresant shaped Sunrise Beach (Haad Rin Nok) to the north. The famous Full Moon Party takes place on Sunrise Beach each month.

The town and beach first became popular with backpackers escaping the tourist influx to Koh Samui in the 1980s. As the popularity of the beach and Full Moon Party have increased, the town has grown to accommodate the new visitors. The town is centred around Chicken Corner, a crossroads and popular meeting spot.

The Full Moon Party is an all-night beach party that takes place in Haad Rin on the island of Ko Pha Ngan, Thailand on the night of every full moon.

The party was originally a small affair with a small number of backpacking travellers dancing through the night of the full moon, mainly to psychedelic trance music. Originally, the music was some tapes coming from Goa'Party (India), and the first Full Moon Party was improvised at a wooden disco not far from the beach in June 1987. The Full Moon Party gained fame quickly through word of mouth, and the event now draws a crowd in excess of 10,000 every full moon evening. The party carries on until the sun rises the next day. All the bars on the sunset beach of Haad Rin town stay open and play music such as R&B, drum and bass, house and reggae. The event has become a part of the itinerary of many travellers to Asia.

Entry to the event is completely FREE OF CHARGE.