Koh Phangan North Coast — Chaloklum, Coral Bay, Bottle Beach & Thong Nai Pan
Koh Phangan's north coast gets a fraction of the visitors that the west-coast sunset beaches or Haad Rin's Full Moon Party draws — which is precisely what makes it worth seeking out. A single arc of coastline running from Chaloklum in the northwest to Thong Nai Pan in the northeast manages to pack in a working fishing village, the island's most accessible reef snorkel, two bays reachable only by longtail boat, and the most naturally beautiful resort corner of the island, all within a half-day of the ferry pier.
Most visitors encounter this coast in fragments: they stay at Thong Nai Pan and never make it to Chaloklum; they take a longtail to Bottle Beach and return before dark; they book a Sail Rock dive from the Chaloklum pier and head back south without exploring the village. Treated as the coherent destination it is, the northern arc rewards the extra effort — the pieces reinforce each other, and a few days moving between the bays and the fishing village beats any single spot seen in isolation.
The practical approach is to base yourself in Chaloklum or Thong Nai Pan and move between the bays by longtail, scooter or songthaew. The island is small enough that the whole northern arc is a half-day's drive from anywhere, though each bay rewards returning more than rushing through all of them in one day.