My family and I were originally planning a summer road trip from St. Louis to California. We decided that was too much for our first road trip so have decided to plan a mini-road trip. We would like to stay within a six hour drive of St. Louis. We would like to camp with maybe one hotel stay. We love hiking and exploring. The kids are 5, 7, and 9. Only problem is we have no idea where to go. Any suggestions?