G'Day Miss 'Girl'....
There is a plethora of very nice places to go and see in 3 days.
However, seeing as you want to fly for only 3 hrs per day, this 'limits' the opportunities somewhat..??
What I suggest is that you might go to 'Google Earth', describe a circle of around 300nm or so from Camden, and take your pick from there.
Or, a few 'local' flights around the Hunter Valley can be very nice....and the 'usual' great hospitality from the West Maitland Aero Club is probably still there..??
Let us know what you do.....