Khao Ra is the highest mountain peak on Koh Phangan, standing at about 630m above sea level and offering the most spectacular view of the island. There is a long trail leading up from the village of Ban Madua Wan and passing Phaeng Waterfall. The trail can be steep and difficult to follow in places, so it is advised that travelers should take advantage of the guide service available at the start of the trek.
Wat Khao Tam is a great viewpoint in Ban Tai, easily accessible on a moped; as are many of the sunset bars on the Nai Wok hillside. Haad Rin has viewpoints at either side of Haad Rin Nok and on the road out of Haad Rin. But in fact there are viewpoints pretty much anywhere on the island, just stop for a minute to appreciate it.
Laem Son Lake is a popular place to cool off during the hot months and relax under shady pine trees; there are also a few rope swings for high diving into the lake. There have been a couple of accidents, so if you swim be careful; only strong swimmers should attempt to swim across the lake and the rope line across the lake is only a guide, not a safety rope; Laem Son is also a protected area so no fishing is allowed.
Ang Thong Marine Park is a group of over 42 tropical islands that are protected as a nature reserve. There is an amazing variety of marine life, Corals, excellent snorkeling, diving and kayaking around the many islands, limestone caverns and a giant saltwater lake. The journey takes around an hour in a speedboat and day trips, camping trips and even overnight boat trips are available. Respect the coral, do not touch it, stand on it or take any shells as mementos.