Thailand now offers an astonishing range of good-value active pursuits, both on land and in the teeming tropical seas.
1 Khao Yai National Park
One of the very few national parks to maintain a network of hiking trails that visitors can explore by themselves, passing dramatic waterfalls, orchids and an abundance of wildlife.
2 Chiang Mai
The best single base for outdoor activities, offering cycling day-trips and multi-day tours, mountain biking, trekking, rafting, rock-climbing and many others.
3 Pai rafting
A good place for trekking, but the real highlight here is the two-day whitewater rafting trip down the Pai River, taking in waterfalls, hot springs and a night in a jungle camp.
4 Umphang trekking
The best way to reach the 200m-high Tee Lor Su Falls is by rafting and hiking your way through the jungle on a three-day trip.
5 Diving and snorkelling off Ko Similan
The underwater scenery at this remote chain of national park islands is world-class and can be explored on appealing, small-scale live-aboards.
6 Sea-canoeing in Ao Phang Nga
Low-impact paddling on day, night or multi-day trips is the best way to explore the secret caves and mangrove swamps of this extraordinary bay.
7 Ko Yao Noi
This relaxing island on the edge of Phang Nga bay is a low-key hub for active visitors, who kayak, snorkel, dive and climb rocks.
8 Rock-climbing on the Railay peninsula
Offering courses for beginners, as well as equipment rental and guides, this is Thailand's premier site for climbers, with over seven hundred bolted routes amid awesome scenery.