G'day Hookie,
Dalmorton, a camp ground across the Boyd River in the Guy Fawkes River SCA, a popular camp ground for those that don't need much, don't know how popular it gets tho.
Buccarumbi, near the bridge is a toilet block, it can get busy, and the toilets don't get cleaned often, if yahoo's have been there they will be dirty.
The Nymboida Campground
http://www.nationalparks.nsw.gov.au/camping-and-accommodation/campgrounds/nymboida-river-campground on the Nymboida River is a great spot, a fair drive from the Old Grafton Glen Innes Rd, not advisable if wet, has a toilet(but not down near the river). It is how ever a free national Park site.
The Nymboida Canoe Center
http://www.nymboidacanoecentre.com/index.html is a good place to base yourself to explore the whole area, from here you can do many day trips, it has showers, toilets and a swimming hole.
Tommy's Rocks Lookout,https://www.nationalparks.nsw.gov.au/things-to-do/walking-tracks/tommys-rock-lookout-and-walking-track
Lucifer’s Thumb,
https://www.nationalparks.nsw.gov.au/things-to-do/walking-tracks/escarpment-walk.The Junction,
http://www.nationalparks.nsw.gov.au/camping-and-accommodation/campgrounds/the-junction-campgroundPlatypus Flat,
http://www.nationalparks.nsw.gov.au/camping-and-accommodation/campgrounds/platypus-flat-campgroundMobong Falls,
https://www.nationalparks.nsw.gov.au/things-to-do/walking-tracks/mobong-walking-trackUnfortunately free camp sites are a thing of the past, with idoits destroying facilities and leaving rubbish.
The Mann River Caravan Park at Jackadgery is another good place to base yourself and explore.
Unless you are completely self sufficient you are limited.
We are self sufficient for up to 7 days(Grog runs out buy then
) and there are other camp sites around the Clarence valley that can be worth the effort.
But as camping gear becomes cheaper, the yahoos and vandals are able to reach and stay at places which we would find as being remote and they are destroying these places which are now becoming locked.
Sorry I'm not of much help.