Yes, Koh Phangan is the home of Thailand's notorious Full Moon Party (as well as the Half Moon Festival, the Black Moon Party, and pretty much every other lunar phase-related soiree), but tens of thousands of drunk tourists have a way of taking the beauty and authenticity out of a place. Luckily, this is not an island without a few tricks up its sleeve. So once the hangover and exhaustion have diminished, you might just want keep these little suggestions handy in order to get the most out of your Koh Phangan experience.
For those in need of some re-energizing solitude, consider renting a moped and taking a ride just north of Thong Sala (the island's main town) to secluded Wat Phu Khao Noi. Yes you might be "templed out" by this point, however a visit to this peaceful shrine not only gives you a break from the crowds but also exposes you to the oldest temple on Koh Phangan. Or you could opt for a swim/hike up the Phaeng Yai and Phaeng Noi waterfalls in beautiful Than Sadet National Park, where there are plenty of opportunities to get out into some relatively secluded southern Thai nature. Since there are a variety of other options at your disposal, we've added some useful links here to help you decide. Suffice to say, should you choose to venture away from the most popular areas, you'll discover that this island has way more to impress you than just a party beach. Why not explore it?