Once in Bangkok you will need to travel to Trat which is about a five to six hour drive, and many tour buses travel to that destination. Koh Wai, which is an island to the south of Koh Chang in Thailand is situated about forty five minutes on a speed boat or a little over two hours on a regular boat from Trat. If the waves are choppy I recommend staying away from the speed boat unless you don't mind getting bounced around a little. The slower boat also gives you a chance to take video and enjoy a nice nap on the way to your paradise destination. Many people don't wear life jackets on the boats but I think its something that shouldn't be overlooked. They have some small carts at the pier where you can buy snacks and refreshments while you wait for your boat to arrive.