From the World Heritage inscription:
This site, comprising several protected areas, is situated predominantly along the Great Escarpment on Australia’s east coast. The outstanding geological features displayed around shield volcanic craters and the high number of rare and threatened rainforest species are of international significance for science and conservation.
Unlike most World Heritage sites, the Gondwana Rainforests isn’t one particular place, rather it is a huge expanse of forest that covers much of southern Queensland. It covers multiple national parks, so there are multiple options on where you can visit.
I visited Springbrook National Park just outside of Gold Coast, Queensland. From the hills I could see the Gold Coast skyline and the ocean beyond. Springbrook is an easy drive from Gold Coast or Brisbane. I was there on a school holiday and the park was packed. In addition to some stunning waterfalls, there is an overlook where you can view the plains of New South Wales.