My husband and I wanted to try out camping with our five-month-old, so we stayed two nights in Upper Sioux Agency State Park at the Yellow Medicine River Campground. The campground was well-maintained, clean, potable water tasted good, the outhouse had toilet paper and hand sanitizer, and the sites/paths were mowed. Our site (#5) did not have any tree cover, so midday was HOT! It looked like all of the other sites had at least one tree, if not a small forest surrounding the site - so it was just our dumb luck to choose the one site without shade [via the DNR website]. The state park has over 18 miles of trails - - - most are grassy paths mowed along the Yellow Medicine River, through the prairie, or over the grasslands - none with noticeable elevation changes.