Almost everything to do on Gili T will involve the water at some point, though yoga, spas and culinary classes all vie for attention.
Diving & Snorkelling
There's fun snorkelling off the beach 200m north of the boat landing – the coral isn't in the best shape here, but there are tons of fish and turtles. The reef is in slightly better shape off the northwest coast, but at low tide you'll have to scramble over some sharp dead coral (bring rubber booties) to access it. Snorkel-gear rental averages 50,000Rp per day.
Trawangan is a major diving hot spot, with two-dozen professional scuba and freediving schools. Most dive schools and shops have good accommodation for clients who want to book a package.
Safety standards are reasonably high, but with the proliferation of new dive schools on Gili T, several have formed the Gili Island Divers Association (GIDA). We highly recommend diving with GIDA-associated shops, which come together for monthly meetings on conservation and dive-impact issues. They all observe common standards relating to the safety and number of their divers. They carry oxygen on their boats, have working radios and dedicate time and resources to the preservation of the reefs, waters and shoreline. They also have a price agreement for fun dives, training and certification. Sample prices:
Introductory Dive 900,000Rp
Open Water Course 5,500,000Rp
Rescue Diver & EFR Course 7,000,000Rp
Trawangan has a fast right reef break off its southern tip that is best surfed December to March or on a windless high-season day. The beach nearby is lined with vendors renting boards.
Walking & Cycling
Trawangan is perfect for exploring on foot or by bike. You can walk around the whole island in a couple of hours – if you finish at the hill on the southwestern corner (which has the remains of an old Japanese gun placement circa WWII), you'll have terrific sunset views of Bali's Gunung Agung.
Bikes (per day from 40,000Rp to 70,000Rp; bargain hard) are a great way to get around. You'll find loads of rental outlets on the main strip, or your guesthouse can help you out. Beware the sandy, bike-unfriendly north coast and note that the paths across the interior of the island are usually in the best shape for cycling.