Within the Paul Bunyan State Forest, there are several official state forest campgrounds, individual hike-in primitive campsites (such as along the North Country Scenic Trail) and also various official dispersed campsites for those who want a back country experience not too far off the beaten path.
Just north and west of the official Group campsite at Lake 21 is a lovely chain of lakes called the Little Gulch Lakes that are perfect for paddling. See this link for a state forest map of the area: the campsite is located by the canoe landing symbol off West Gulch Road:
https://files.dnr.state.mn.us/maps/state_forests/sft00038.pdf
The lakes are clear and pristine, and far from crowds although within an easy drive of Akely, Bemidji, Itasca and Park Rapids. This is a great destination for canoeing or kayaking from ale to lake, all along a unique glacial moraine with deep quiet forests, plenty of wildlife, and crystal clear water in narrow but very deep glacial lakes. The canoe landing at Second Little Gulch has not only a nice access for non motorized craft, but also has a little known but really lovely primitive campsite that could accomodate several small groups. Best for camping, it would have room for a small trailer or two to drive in, but of course there are no hook ups of any kind as this is a backcountry location. There is a pit toilet, many good tent sites, and a picnic area, all on a lovely peninsula on the north side of the lake. You can easily drive to this location on back forest roads, though note that these roads are closed in winter and spring.
There is no well or pump or other water source at this campsite, and though the water is basically clear and clean you should either bring your own water jus or plan to boil or filter the nearby lake water as there is a lot of beaver activity in the area.
You can do some hiking along the quiet forest service roads nearby, paddle the chain of lakes, or go fishing. The lakes are not heavily fished, but they are not regularly stocked by the DNR either. It may be of interest for those fishing that the substrate of these lakes favors small mouth bass, which are fun to angle for but are fairly uncommon for this neck of the woods!