The Flinders Ranges in South Australia are old. There's a gorge area that dates back 850,000 years call Brachina Gorge. We camp there sometimes although it's public so they may be others around.
That's deep in the Flinders Ranges though, some six hours from here are 110kph all the way. Not a day trip.
I know so many people who don't like camping and getting into the outdoors like Faith and I do and some would say they could stand to do so, however I think they don't know what they are missing.
Outdoors is awesome once you get the taste of it