After doing some research on different boat tours, my friend and I booked with Simba Sea Trips, and are so happy we did. It was expensive for a student budget, but well worth it. The staff really has thought of everything, from motion sickness medicine to water proof satchels, to wifi on the speedboat. The size of the tour is about 16 max, which was perfect and felt very private. The tour that we did (Phang Nga Bay and Koh Panyee) also involved such a variety of activities- swimming, kayaking (well being kayaked around by a local guide, much more enjoyable), cave walking, visiting James Bond Island, and visiting a very unique Muslim village all built on stilts. Would highly recommend this company to anyone!