Arkansas--well yeah it's a lot like Missouri, but the mountains are bigger. I like it mainly for the mountains and its proximity to Kansas--I used to be able to go down there for a weekend trip from Wichita, when the infinite flatness was driving me nuts.
The thing that pisses me off is that the country is getting a lot bigger as gas prices keep rising, unless they start coming out with some really practical high-efficiency cars. It's a lot harder for an average person to take a cross-country roadtrip now.