The south east part of Kohphangan is the main party area which includes Haad Rin and the fullmoon party beach. Nearly all of the area around Haad Rin is mountains making most of the excellent fine white beaches unaccessable by road, the only way to get to them is by longtail boat from Haad Rin.
Without question, Ko Phangan has some of most beautiful beaches anywhere in the country.
If it's boring for you to laying on the beach, try something different. the island offers many day-time activties like Wakeboarding, Dirtbike Rentals, Elefant Riding, Djungle Trecking, Snorkeling, Thaiboxing, Yoga Lessons,a Chinese Temple and Thai Cooking Lessons.
You can book for a wide range of Bungalows on Koh Phangan for every type of budget, availible to book in advance here.