The remote Ingar Campground in the Katoomba area in the Blue Mountains, is just two hours from Sydney.  Camp sites are completely free on a first come first serve basis. This location is great stop on your walking or cycling adventure between Wentworth Falls and Woodford.  Try also the Acacia Flat campground in the Blackheath area, after a hike via the Blue Gum Forest (internal link to Blue Gum Forest Hike).