Mu Ko Angthong National Marine Park, Surat Thani Province, Thailand.
Angthong National Marine Park makes for a great day trip from Koh Samui, Koh Phangan, Surat Thani, or any of the other outlying islands. The park boasts some of the most stunning unspoilt beaches in the country, breathtaking views of limestone giants, and countless opportunities to shoot images of iconic Thai longboats - though I'm hopeful that one day tour operators will help their boat captains make the switch from diesel-belching school bus engines to a more environmentally friendly form of oceanic propulsion.
101 different outfitters can organize a trip for you, and there are options to suit any budget - slow boats that carry upwards of 50 people, speed boat trips, and luxury cruisers all ply these waters. Look at spending a day at Angthong the next time you set out for Full Moon Party adventures - the detox will do your body good.