This is a photo of the bus we took from Bangkok to the pier in Trat, where we were continuing our journey by ferry to the island of Koh Chang. The bus is probably the easiest and most economical way to get to the pier. The fare was reasonable (can't remember how much we paid) and the entire trip with one short bathroom brake lasted about 5 1/2 hours. The bus was actually quite modern and comfortable. It was fully equipped, air conditioned and seat distances were similar to premium economy class in a plane. A big plus of course was that you could actually see where you were going (planes are just more boring!).