If you plan to tick off several of Sydney big-ticket attractions, a combo pass across two, three or four sights is the sensible way to save. It bundles the Darling Harbour favourites, from the aquarium and wildlife zoo to the Sydney Tower Eye and Madame Tussauds, into one flexible ticket you can use over several weeks. The pass suits first-time visitors trying to see a lot without booking everything separately. Start with the Tower Eye on a clear day for the widest view over the harbour.