Being on the Great Barrier Reef, of course we went snorkeling.  It was very reasonable, the food was great too. Eric got so enamored with feeding the Batfish he stayed in the water way to long.  Good thing I brought a sweatshirt.  both of us forgot towels, but all the folks on the tour with us chipped theirs in to wrap a teeth-chattering blue Eric up in them so he could get his core temp back to normal.  The coral IS amazing there on the reef, and we were only snorkeling. I cant imagine what it is like on a dive.