If you would like to learn more about the Reef, for an extra cost you can join a guided snorkel tour with a marine biologist. (barrierreefaustralia.com)
For the guests who do not like being packed in, this afternoon sail and snorkel tour offers plenty of elbow room. (shoreexcursionsgroup.com)
Most snorkel tours include equipment, but you are welcome to use your own gear. (caradonna.com)