Road Trip!

It’s a long weekend here in Australia for ANZAC day so I’m considering going on a road trip. Not sure where I’m going yet, but my last road trip took me down into northern New South Wales and I’m thinking of heading down that way again – I figure my random selection of which way to turn should take me somewhere else this time (I don’t actually own a map of anything outside of the Brisbane region). I’m considering trying to get to a national park I vaguely remember around there, but I can’t remember the name of it or where it is so I’m not sure how much success I’ll have with that plan. Anyone got any suggestions for places to go for a day trip or possibly an overnighter around Brisbane?