Salad Beach on Ko Pha NganThan Sadet-Ko Pha-Ngan National Park The park is named after the river Than Sadet (lit. Royal River). The river forms the largest waterfall on the island, which was visited by several Thai kings. Especially Rama V liked the placed and visited 14 times.
Visit the beautiful waterfalls and lookouts in the interior of the island.
The herbal sauna at Wat Pho is a great relief after long party nights. It's near the 7/11 branch in Baan Thai, on the south-western side of the island. Don't forget to leave a donation, always wear a sarong (over your bikini) - remember that you are on temple-territory and locals find nudity offensive. This is not a European sauna, sitting naked will get you into trouble.
If you're into fire, you'll find spinners and twirlers on many of the beaches, teachers abund and poi are easy to find.
Visit Ko Ma off the north-west coast of Ko Pha Ngan.It offeres one of the best snorkeling places on the island.
On the road between Thongsala and Chaloklum is beautiful Chinese Temple with overlooking on Chaloklum Bay.
There is a Elephant Camp on the way from Baan Tai to Thong Nai Pan, take a photo or try trekking through the jungle.