I took the class to Manly via the Spit Bridge walk. They were a bit startled by the distance involved - 9 km - but I guess I do more walking than most. It's a good introduction to bushwalking, as it's hard to imagine that there's an easier walk with actual bush, plus the views are amazing and as a bonus there's Washaway Beach, which only a local is likely to find and involves climbing down a small cliff for added excitement. Additionally, we had a nude bather for the authentic Sydney experience. (The locals are always tearing down all the signs; the people of Balgowlah deserve a private beach.)
For me though, the highlight is the trip home on the ferry. I took this with my "real" camera, and the auto focus got a bit confused, which YouTube offered to fix - hence the dancing bridge.