We visited the Badlands and Yellowstone areas in different Septembers, good weather, no crowds. http://www.nps.gov/badl/index.htm and http://www.nps.gov/yell/index.htm See Wind Cave: http://www.nps.gov/wica/index.htm. If you are in that area around sunset, you'll see many Bison and maybe wild horses and burros. See Mount Rushmore at night and Crazy Horse Memorial in the day. When you are driving the highways in the area, you will see Mt. Rushmore in the daylight along with spectacular sights. http://www.nps.gov/moru/index.htm http://crazyhorsememorial.org
We were in USAF just east of STL, it's a great city. Be advised, it is very hot and humid in July and August! You have to do the Arch, check out the museum while you wait for your ride to the top. http://www.nps.gov/jeff/index.htm It and the Budweiser brewery were mandatory tours when we had company! Check out the public library, they don't build them like that anymore.
Check out Pictured Rocks National Seashore in MI. http://www.nps.gov/piro/index.htm We stayed at a city RV park just west of Munising Falls. It's about fifteen minutes to town and the tour boat. It was amazing! Who knew that leaching water could paint rock faces? After the south end of Lake Superior, go to Sleeping Bear Dunes National Lakeshore. Be sure to hike UP the dunes after you view the lake, not DOWN the dunes at the lake's edge! We never made to the top, not as young as we used to be! http://www.nps.gov/slbe/index.htm
Have fun!
