Sir William

Sir William is a 45 ft (13.7 m) speedboat built in 2026 and laid out like a yacht. A hardtop shades the lounge behind wraparound glass, a double sun pad fills the aft deck, and a second lounge sits in the bow. On board there is a private washroom, an outdoor shower, a Bluetooth speaker, snorkelling equipment and a paddle board. Two Honda 350 hp outboards give a cruising speed of 25 knots.

The boat leaves from Royal Phuket Marina. Half days go to Koh Maiton and Phang Nga Bay. Full days go to Phang Nga Bay, the Phi Phi Islands, Racha Yai, or Koh Yao Yai and Koh Yao Noi, where the day combines time on the water with an excursion ashore. From 15 October to 15 May the Similan Islands are also available. The captain and crew handle the boat, and an English-speaking butler looks after guests through the day, including the beach picnic.

Full day, 8 hours, from Koh Yao: 53,500 THB in low season (1 June to 30 September), 64,200 THB in high season (1 October to 30 May), 74,900 THB in peak season (15 December to 15 January). Half day, 4 hours, from 42,800 THB. Similan Islands full day from 105,930 THB. Some destinations and additional guests cost more, and the concierge will confirm the exact price.