Like off Koh Tao, I don't suggest
diving here (free or SCUBA) unless as a beginner.
(Or easily pleased in general.)
Or if at all, given that your instructor's attention will be
quite challenged by the many other divers bobbing along!
Our boat captain was kind enough to drop us off among the SCUBA
divers instead of snorkelers, so Huck and I were able to push a
bit more depth than found at the shallows.
Sadly, we still didn't see more than a pair of banded
krait with their heads buried under some coral.