Found this dive shop at TripAdvisor before coming to Koh Lanta, and the booking was smooth on line and picking up was very much on time( which is very rare in Thailand) . I specifically chosen a big boat in stead of speed boat, though it might take longer( 2 hours) to the dive site, but the trip itself is totally worthy. I chose the 2 days 4 dives package, the first day I was given to a freelance Malaysian diver guide Evan due to many divers that day, I was a bit concerned but Evan had proven to me that he is professional enough to show us around Koh Ha islands. however I felt of the stairs and hurt my ankle and leg. The crew were very nice and experienced to help me stop the pain, I was very worried if I could dive the next day!😂 luckily I could ! The second day we went to Koh Bida, my diver guide changed to the funny Spanish dive guide Antonio, he was very strict with me and showing me that is more important to see beautiful underwater creatures by our own eyes than taking pics. And during the last dive he was very patient to improve my buoyancy skill. This is by far the longest feedback I have given out on TripAdvisor, I am just happy to be able to meet these lovely people at Koh Lanta! Choose Go Dive will be the best choice u would make in Krabi !