I made the mistake of staying at Plantation recently. As it's currently 'officially' free (but then aren't they all?) it seems to have defaulted to the party campground (rules only require you to 'reduce' noise after 11), which is great if you're into that sort of thing, but not so great if you don't want to be reminded how old and boring you've become.
No end of great bush camping options to be found, but outside of long weekends I've never had an issue at any campgrounds - not that they're particularly relaxing places to be on long weekends anyway!
And don't underestimate picnic grounds either - Mt Zero seems to always be full of Wicked vans.