Day trips: Koh Pha Ngan and Koh Tao
Samui is the gateway to two neighbour islands. Koh Pha Ngan, a short speedboat hop north, is famous for the Full Moon Party at Haad Rin beach — a massive all-night beach party held roughly monthly around the full moon (with occasional extra Half Moon and Black Moon events); by day Pha Ngan also offers quiet beaches, waterfalls, and yoga retreats in the north. Koh Tao, further out by ferry, is one of the world's busiest and most affordable scuba-diving training centres, with shallow reefs ideal for beginner certification and abundant dive schools. Both are doable as day trips, but Koh Tao especially rewards an overnight stay.
⚠ Verify live
Full Moon Party dates, ferry crossing times/prices, and dive-course costs — verify live / handled by a human.
General information, not legal advice. Laws and practice change; for a decision that matters, confirm with the authority named in the sources or a licensed professional.