The Andaman Sea around Krabi has some fascinating islands to visit and the best way to get around is with someone who knows what he's doing: Book a tour and get to see such exotic places as Maya Bay, Poda Island, Chicken Island and more.
A full-day tour will include a scrummy lunch while a half-day tour will make sure you're back for lunch. Either way, enjoy and whatever you do, don't forget your camera.