how far west on I-70? What type of things do you enjoy?
1. Kentucky Horse Park Lexington KY. Nice campground (Google Kentucky Horse Park Campground. Suggest reservations. Museums, theme park, horseback riding.
2. St Louis - Gateway Arch - Casino Queen RV Park -shuttle to casino and MetroLink train.
3. Kansas City - National World War I Museum, Arabia Steamboat Museum. We stayed at the campground at Worlds of Fun, Oceans of Fun.
Instead of Kansas City if you haven't been, I would drop down to Oklahoma City and visit the Memorial there. We stay at Twin Fountains RV Park. Then to Amarillo. We like Oasis RV Park and take a drive to Palo Duro Canyon. You can also camp there if you like remote and no cell service. Then Albuquerque before you head north to Colorado Springs and Denver.
4. Denver & Colorado Springs, Pike's Peak, Garden of the Gods, Red Rock Canyon, Estes Park. We stayed at the KOA in Fort Collins. There is so much to see and do in this area. Also Silverton CO take the train.
5. Utah?