2 day trip to Koh Surin. We slept in a tent at the beach and it was quite ok (temperature in the tent not too high and with ear plugs no problems with longtail boats). Best place so far for snorkeling. Loads of fish (even saw one maybe 2m reef shark and a sea snake) and often nice hard corals. Few tourists when we had been there. Definitivly recommend the overnight trip.