Snorkelling on Koh Phangan
Snorkelling on Koh Phangan is a different experience from the island's SCUBA diving scene — no certification, no equipment course, no long briefing. You pick up a mask and fins, wade in and look down. The island delivers enough variety to keep that simple act interesting for a week: a reef you can walk to across a natural sandbar, calm headland coves with coral in the shallows and, if you want the headline version, a day-trip speedboat to Ang Thong Marine Park where limestone karst islands frame turquoise water so clear it looks implausible.
The standout site is Koh Ma on the northwest corner — a small islet attached to Mae Haad beach by a sandbar that appears at low tide. The reef wrapping around the islet is widely regarded as the best accessible snorkelling in the Gulf of Thailand that doesn't require a boat, and the Koh Ma Snorkel & Sandbar Tour turns it into an organised half-day for those who want gear and a guide included. Haad Salad, a sheltered bay a few minutes south, offers coral and reef fish around its rocky headlands for independent swimmers who prefer to self-guide.
Ang Thong is the big-picture version. Some 30 kilometres southwest of Koh Phangan, the national marine park protects an archipelago of around 42 islands where the snorkelling happens in channels between the formations, with sea kayaking and a viewpoint hike typically included in the same day. It's the sort of trip that answers the question of what to do on a day when you want more than the beach in front of you.