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From the 1770 marina one can take a number of tours out to the islands and reefs of the Capricorn-Bunker Group, which is the southermmost part of the Great Barrier Reef Marine Park.  The most well-known of these islands is Lady Musgrave Island.  Lady Musgrave has a huge lagoon, eight kilometers in circumference, but the boats out seemed a little too touristy.  Another boat, to Fairfax Island, was not going out this particular day.
I went out on the 1770 Undersea Adventures boat Narcosis, to the Hoskyns Islands (there are two, East and West).  The Narcosis is a no-frills 14.8 meter (48 foot) West Coast cray boat outfitted as a dive boat.  On board, in addition to the captain, two dive helpers, and a general assistant, were about 18 people, half divers and half snorkelers.
A bit too crowded and more expensive...
Report on the 2009 Queensland Expedition - Eric M. Appleman