Hat Noppharat Thara–Mu Ko Phi Phi National Park collects a 400 THB conservation fee from every foreign adult who enters its boundaries—revenue that funds coral restoration across 390 square kilometers of protected Andaman waters. The park encompasses the Phi Phi archipelago, where limestone cliffs rise 100 meters above turquoise shallows and blacktip reef sharks patrol staghorn coral gardens at depths of three to eight meters. Maya Bay, closed to boats between 2018 and 2022 to allow ecosystem recovery, now enforces a daily visitor cap of 300 and prohibits anchoring within 300 meters of shore. The best snorkeling tour in Phuket departs between 08:00 and 10:30, when plankton blooms are minimal and horizontal visibility reaches 15 meters before midday winds roughen surface conditions. Operators run speedboat circuits to Bamboo Island's white sand shallows, Khai Nok's resident parrotfish schools, and the Similan Islands' granite boulder swim-throughs 84 kilometers northwest of Chalong Pier. The Similans open seasonally from late October through mid-May; outside that window, Phi Phi and Khai islands absorb the majority of snorkeling traffic. Phuket marine excursions operate under National Parks, Wildlife and Plant Conservation Department permits, with ranger checkpoints at Ao Nang and Laem Nga enforcing life jacket mandates and fish-feeding prohibitions. The park's reef system hosts 30 species of hard coral—Acropora, Porites, and Pocillopora dominate shallow zones—and 180 reef fish species including leopard sharks, grouper, and moray eels. Water temperature holds steady at 28–30°C year-round, eliminating wetsuit requirements. Speedboat tours to Phi Phi islands cover 40 kilometers each way, with journey times of 45 to 60 minutes depending on sea state and hull design. Early-bird departures to the Similan Islands require 08:00 boarding to allow four hours of reef time before the 16:30 park closure. Operators provide mask-snorkel-fin sets, but prescription masks and reef-safe sunscreen remain passenger responsibilities. The conservation fee is collected at park gates or aboard vessels holding blanket permits; retain the receipt for same-day re-entry at secondary sites within park boundaries.