You should include the sandstone curtain aka Great Dividing Range. The run to Braidwood Moruya, up the coast past Nowra (pm Fri to Sunday, You will need a clearance otherwise), past Wollongong, over to the Oaks, to Katoomba, Cowra and back to YTEM. You get a good view of the coastal ranges and coast and your friends will see what a great country you are flying over. This route also provides an immense variation in scenery and terrain☺