If you are planning to be in the WI Dells and want to stay out of the craziness of the city- this is a great alternative! We spend the weekend here and ended up spending a lot of time in the park. Nice lake area to rent boats and a few hiking trails. Sites are somewhat secluded with trees between sites. Pit toilets as well as more modern bathrooms with showers available.
We camped here in early fall and the full shade sites in mature forest were great. There are a lot of raccoons and the sites even come equipped with a pole for hanging your garbage out of reach of the coons.
The lake, when we went in late August/Early September had a lot of algae on it and wasn't really good to swim, but they do have boat rentals and fishing. It is generally a beautiful lake.
There is a good amount of hiking in the area and it is in close proximity to the Wisconsin Dells, so there is plenty to do.