You can sail complimentary catamarans, dinghies or windsurfers, either from the hotel's beach or on the lagoon.
Expert scuba-diving instruction is also available on the grounds.
Mountain-biking around Bang Tao, the charming valley where Laguna Phuket is located, is a splendid way to appreciate both the local scenery and the local Thai culture.
Sheraton Grande Laguna Phuket can organize everything from sailing regattas to accredited sailing courses or gamefishing tournaments. Or you might try sea-canoeing amid the spectacular limestone karst scenery of Phang Nga Bay, where guides lead you into mysterious hidden worlds within the islands' collapsed cave systems full of tropical flora and fauna and accessible only by means of sea canoes at low tide.
Diving daytrips take you to some of the finest coral reefs in the region. Marine life commonly seen includes sea turtles, manta rays and whale sharks.
For walking in virgin rain forest, Khao Phra Thaeo Forest Reserve, a sizeable patch of jungle not far from the Sheraton Grande Laguna Phuket, makes for anything from a two-hour hike up a series of waterfalls to a full day's trek.
Just off Phuket island lies magnificent Khao Sok National Park, where more extended forest tours are possible. Khao Sok still has wild tigers and elephants, though these inhabit reaches deeper than most casual visitors are likely to penetrate.