We also stay at Casino Queen just across the Mississippi River from the Arch. There is great security at the casino and I think you could overnight in one of their parking lots if you did not want to stay in the campground. We went across the river via the Metro stop located by the Casino. Security will even pick you up and take you to the Metro. In Nashville, we stay at the KOA on Music Valley Drive and take the Downtown Shuttle (fee) so we do not have to worry about finding parking for our dually and we might want to have a libation. There are two additional campgrounds next to the KOA. The KOA has better sized sites for our big 5th wheel. The Country Music Hall of Fame is a must see along with the Ryman. Can't help with KC.