Have you heard of the "I Can" program through MN State Parks? Noah had some interest in rock climbing after trying the army recruiter tower at Rochesterfest, so we took him out to Blue Mounds to get a little more serious about climbing.
Luverne, MN is just down the road from Blue Mounds and has a river area that caught Brian's eye while figuring out what else to do while over there. There's a playground and city park adjacent to a fun spot on the river.
There's also a National Wildlife Refuge within a couple miles of Blue Mounds called Touch the Sky. It's an area that was restored to native prairie. We chose to hike the <1 mile prairie waterfall trail. It was absolutely gorgeous! It reminded us of the north shore with large rocks to jump across, but it was surrounded by flat expansive prairie land and big sky.
We camped overnight there too, but the camping wasn't much to recommend the place. Blue Mounds has a rentable tipi camping option, we might see if we can get that next time - they built the tipis in the best camping area. We were deep in the woods and could barely stand to be in our campsite because of the mosquitoes. I bet it's beautiful in the fall too, after a frost so the bugs are gone...