We just got back from an excellent 4 day excursion to the DT's.  This morning I dove a site in the park called Big Bommie.  It was awesome, and not dived very often or even marked.  There were goliath grouper and all manner of other fish everywhere.  For fish density this was about as good as it gets.  Sort of all made up for a painfully greasy evening spent with the Spree's 3 Detroit 1271 motors.  I was cleaning the center engine, mostly with my clothes I think.