Our SnorkelingDay has been the best so far.  We boarded the boat at the Warf and it went out to the great barrier reef,  This ride took about 1 and half.  The company has a platform anchored out there.  They offered helicopter rides (for a price). The Snorkeling was fantastic.   Plenty of tropical fish.  They were very used to people and would come right up to you.  We also went out in a semi sub, which means we sat in a deep glassed in bottom of a boat.  This toured around the reef.  Very awesome