The area of Shoalwater Bay and surrounding islands is, as Brandon said,TOUGH!!!!!!!! No such thing as letting a fish run around on a long leash there...was awesome to film it!
Break Sea Spit is my favourite in terms of 'frontier feeling' when out there (you really do feel like you could fall off the planet!) and for the sheer size of the GTs that live there...the terrain does you no favours either. It's a challenging fishery.
Close to home, I'm spoiled by a good fishery of large G's within an hour of Brisbane...not many shots at fish compared to some Great Barrier Reef hot spots, though the average size is large!