The morning light off Phuket glances across the Andaman sea as a speedboat slips out of the harbor, the engine a steady heartbeat underfoot. Within an hour the islands rise—sheer limestone cliffs, postcard beaches and shallow reefs that dare you into the water. This full-day circuit moves fast: Khai Nui for first snorkel, a private stretch on Koh Yao Yai to breathe, a quick photo stop at Mosquito Island, then Bamboo Island’s sand and Phi Phi Don’s Ton Sai for lunch and people-watching. The route finishes with the dramatic limestone amphitheaters of Phi Phi Leh—Viking Cave, Pileh Cove, Loh Samah and the famous Maya Bay.