Ok. Had my own snorkel gear but left mask on board. You can not just rent a mask, even though they sell snorkel tubes. So I had to spend $30 for the whole package.
Did the climb. Amazed at how dangerous it seemed to be. Peddlers on way to bus were very aggressive. Just go straight to bus and avoid the tourist trap walkway.
Great island, great Turtle Farm. Very clean and lots of turtles. Large salt water snorkel feature and fresh water waterpark. Bring swimsuit. Snorkel feature is a huge circular natural water path. Next time I will be sure to use it.