Thanks! My wife and I are FAR from cultural snobs. Last summer we spent two weeks driving around rural Nevada, and loved it! Did the Vegas thing and that was nice, but we had more fun checking out the numerous ghost towns. We're history buffs, so museums fit the bill...
The Cosmosphere has a detailed display of the history of rockets, including the German programs during WWII, and it has displays of the Apollo 13 space capsule, Gus Grissom's space capsule that sank (along with dimes on display), and a lunar rover. It also has several auditoriums, including a planetarium, where they conduct demonstrations. I don't remember if they have an IMAX, but I'm thinking they do.
If this type of thing interests you, it's worth the drive to see.