I have to say, of all of the campgrounds and parks that I have visited in southern Iowa near highway 34, Three Mile is the best.
This park is clean with nice amenities and a beautiful lake. During the week you can almost have the place to yourself… it is a different story on the weekends.
You can tent camp or pull your camper and just enjoy the setting. If you don't like to tent camp and don't have a camper, don't worry, there are several cabins for rent.
There are showers and bathrooms and an awesome playground for the younger kids.
I am definitely adding this to my list for regular stays with my family.