Looking for a 4wd Park, Family weekend, Place with Bush walks or . . . ?
4wd Parks:
Scenic Rim, Rover Park, Levuka, Emu Creek
Family Weekend:
Lamington, North Straddie (Beach or Camp grounds), Goomburra, Border Ranges
Camping + Walks:
Stinson Air Crash, Mt Warning, Girraween National Park (I really like the walks here, great for kids too. Campsites not the best and ~4hr drive though), Mt Barney (Advanced walk)
If I go looking for a new place to go camping I check ExploreOz. To get the full info and stuff you need to subscribe (which I haven't) but it gives you a great place to start, then you can use google to find some actual/decent information about the camp grounds.
http://www.exploroz.com/Places/Find/Camp_Free.aspx