Well, tagged along here with a large group of friends with Camper Trailers. We had 6 trailers in total. Camp Cobark has about 5kms worth of property on the Cobark River. It is broken up into several sections. We camped at the 'Main Camp' which has hot showers and flush toilets. I did not use the hot showers but certainly used the toilets (especially after a night on the drink haha). They looked basic but for $15 a night everything is there for you.
Camp fire was allowed and worked well, we did some exploring during the day around Polblue, Gumni Falls and you weren't too far from Moonan Brook & Moonan Flat. It was great weather, pretty hot and we all finished the day off by laying in the refreshing river which was shin deep drinking cold beers and having a laugh.
There are no powered sites, (I didn't see any), camp sites are on plush grash and it is great scenery. A great place to base yourself if you intend to do exploring etc.
One thing we did notice, there were a couple of other groups with children and someone brought their own lawnmower to mow our their paths and camp areas. A good idea I guess?
Put it on your to do list!