Visitors are usually stunned by the sheer size of the Harbour and the sheer numbers of things to do in Sydney.  There’s so much of it to explore and the $39 Captain Cook hop-on, hop-off Harbour Explorer makes it all too easy. Board one of the Rocket Ferries, which run at regular intervals between eight drop-off points, like Shark Island, Watson’s Bay and Taronga Zoo. The pass is valid for 24-hours so you can take your time exploring each destination.