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Best answer
11
Coral Island (Koh Hey) — 45 min from Chalong, cheaper (800–1200 baht), crowded beach, OK snorkel, back by lunch if rushed. Racha Yai — longer speedboat (60–90 min), clearer water, pricier (1500–2200 baht), better if you want "wow" photo once. Pick Coral for easy family intro; Racha if you've done Coral and want upgrade. Both cancel rough seas. Book morning departure — afternoon clouds common. Sunscreen reef-safe if snorkel.
5
Coral easier half day — Racha longer crossing, prettier water on good day.
3
Racha has beach club vibe now — chair rental extra, budget for it.