Harbour views define the postcard, but ferries also function as cheap scenic rides—use them to link the Opera House area with Manly or other wharves when the weather cooperates.
Sun here is stronger than many visitors expect; sunscreen and a hat matter even on mild days. Surf beaches have flags for safe swimming—respect them, especially if you are not used to rips.
Food runs from fine dining to strong Asian and Middle Eastern pockets in the suburbs. TopTenAtlas rankings work well paired with one coastal walk and one museum so you see both nature and city culture.