Things you can see.
Weedy sea dragons, Pot Jackson sharks, wobbegong sharks, blue grouper, nudibranchs and during winter dusky whaler sharks.
Things to be careful of.
On the weekends, Shelley Beach can be inundated with diver-ignorant boat owners, especially during the summer months. Parking is relatively expensive in Manly, but avoiding a ticket will guarantee you a hefty fine.