We stayed at the rustic campsites and weren’t impressed. The sites felt very exposed and were directly under black walnut trees, which were noisy and uncomfortable when the nuts dropped—especially in the fall. Definitely clear the walnuts before setting up a tent. The rustic bathrooms were poor, and the nicer running water bathrooms required a drive to reach.
The regular (non-rustic) sites were even more crowded, packed with RVs and lacking privacy. On top of that, planes flew overhead constantly from about 10 a.m. to 8 p.m.—so loud and frequent it felt like a flight school was nearby. Mosquitoes were also heavy, likely from the large marsh in the park.
The nearby town of New Ulm was very charming, but overall, I wouldn’t camp here again.