Money on Koh Phangan
Managing money on Koh Phangan is straightforward once you know the pattern: carry more cash than you think you'll need, top up in Thong Sala whenever you pass through, and treat a card as a useful backup rather than the main payment method. The island runs largely on Thai Baht — markets, massage spots, longtail boats, smaller guesthouses and beach shacks all work in cash only.
The ATM network is solid in the island's two main hubs, but coverage drops off sharply at quieter beaches. A few minutes of planning in Thong Sala at the start of each leg of your trip keeps everything smooth.