Welcome to Koh Samet, Thailand
Koh Samet is one of the closest islands to Bangkok - making it an easy overnight or even day trip from the city. Rent a motorbike and ride to the south part of the island to enjoy the crystal blue water and spend your day lounging on the sand.
Disclosure: This is a national park so you may be made to pay a fee of 200 baht upon entrance (or rent your motorbike before the entrance and ride your bike quickly through as if you didn't know).
Rent a Motorbike
Typically, motorbikes run for 300 baht per day or 100 baht per hour. With some patience and determination, you may be able to bring the price down a bit. I believe I paid 200 baht for about four or five hours with my bike, but it wasn't easy to land this deal.