a great place to visit, just a few hours out of Bangkok (more if by bus). so it’s not an epic to get back to bangkok in the evening the next day— a good weekend trip, popular for people from bangkok.

I like a beach to have hills in the background so a few hours more (or a quick flight from Bkk)then your in Koh chang

http://www.43places.com/places/view/199501

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This website (not mine) gives a bit more ideas about ko sumet:

http://www.bugbog.com/beaches/beach_pictures_thailand/beach_pictures_ko%20samet_2.html