Cockatoo Island is a UNESCO World Heritage convict site in the heart of Sydney Harbour and the only island where you can stay overnight. The island served as a convict prison and later a shipyard. Explore the Barracks, Mess Hall, Guard House, and Solitary Confinement Cells of the Convict Precinct. Camping on the harbour's edge has been described by Lonely Planet as one of the world's most spectacular campsites. Entry is free. BYO tents from $55, glamping tents $105-315/night. Ferries run daily on F3 and F8 routes.