We spent four nights at Rocky Arbor State Park in Wisconsin Dells, Wisconsin. It's a nicely wooded campground with one modern bath house but mostly pit toilets. (This seemed to be a theme in the Wisconsin state parks...new bathrooms are being added). Sites are gravel and some leveling was required. Electric sites are available but you have to haul water. Most of the sites are screened by abundant vegetation from the neighbors and the campground is very shady. Administration is shared with nearby Mirror Lake state park which is very nice.
I have to admit I picked the park from a map because it was located fairly centrally to several things we wanted to visit. I didn't know until I got there that Wisconsin Dells is a neon lit water park roller coaster jukebox of a town! Not our cup of tea at all. But, the park is several miles from town and you don't have to pass through the frenzy if you don't want to. It provided us access to Baraboo, Spring Green, Horicon, and other areas of the dairyland that we wanted to visit.
The only negative I have for the park is that it's located just off the freeway and the traffic noise is pretty loud. If we had been in the sites closest to the freeway I would have gone elsewhere. At the site we had, closer to the modern restroom, it was OK.
Another thing I missed when researching this trip was that Wisconsin state parks require a $10 daily entry fee on top of the camping fee. However, you can buy a yearly pass for $40 and since we were staying in the state two weeks, that made it more bearable.
I would stay here again if my site was far from the freeway.
http://www.mirrorlakewisconsin.com/