My partner and I camped here with our son for a night. We reserved a spot kind of late and wound up between the shower building and a loud group of hunters in an RV. If we return we'll definitely try to get one of the more secluded walk-in spots that are maybe 40 meters off the road. I'd recommend those spots in any case, if you don't need any of the amenities of the spots very close to the road.
Bring cash for firewood. You can get it on sight (need $5 bills to use the giant wood vending machine), or you can get it at the nearby general store.
The trailhead for the Ice Age Trail is close to the entrance, and there are lots of other spots for fishing, picnicing, or biking.