I took my kiddo to Astico County Park mostly because I discovered they had canoe rentals, and I thought it would be fun to give it a try.
The website says they offer half-day or full-day rentals, but onsite they also give the option of hourly. One hour was perfect for us.
Once we got our canoe safely back to harbor, we did a little more exploring of the park. It was mostly campsites and trails, but we did find a little playground. I definitely wouldn't go to this park specifically looking to play on their playground because it was pretty minimal, but it was a nice enough pit stop.
Astico Park does have bathrooms.
N3620 County Road TT ~ Columbus, WI ~ 920-386-3700
Admission: There is no entrance fee, but there are fees to rent canoes/kayaks and to camp.