Ko Pha-ngan

Ko Pha Ngan is an island in southeast Thailand that’s renowned for its monthly Full Moon Party. This boisterous night-long celebration, which is tied to the lunar calendar, draws revelers to its southeastern peninsula, Haad Rin. Most festivities center on Sunrise Beach, whose beach bungalows attract a backpacker crowd. On the north coast lie quieter, white-sand beaches including Hat Khuat and Hat Thian. ― Google