Love Koh Samet as like you said it's so close to Bangkok for a quick weekend getaway. Yes, Pattaya is closer or even Hua Hin, but just the feeling of being on an island with less tourists and a bit better beaches (still not great) is somewhat more relaxing. Sam went there six/seven years ago when the roads through the island weren't paved, but Becca went there last year with a friend visiting from the U.K. and had a smooth ride with their rented scooter. Best way to explore the island, which can be done in a day! :)