Flambeau State Forest, WI
We just stayed three nights at a campground in Wisconsin's Flambeau State Forest. There are two campgrounds on two separate lakes. We chose the the one that was at the end of a mile long road on Lake of the Pines. It's rustic but very well taken care of. We had the whole place mostly to ourselves (only three other campers) and had a spot that over looked the lake. We kayaked, swam and enjoyed the wildlife, especially the loons. If you are going through Wisconsin it's worth checking out.