We spent our week outside of St. Louis, Missouri at the pin oak creek campground. https://pinoakcreekrvpark.com/
This campground had great wifi, mini golf, and our spot was quite big compared to other places.
We took a day trips to Meramec Caverns to explore. It was very touristy but still fun to do something different.
We rented scooters and overall covered 10 miles between where we got lunch to the arch to forest park and then back to our car.