The Heritage Museum is a must see. We spent a solid 3 hours in there just reading and poking around the vehicles, but if you can visit and catch the staff for some info then you could easily eat up a day - likely more, depending on what stage of Cruiser-itis you have. There's just SO MUCH info there. I gave up trying to soak it all in and plan on going back.
The US as a whole is a beautiful piece of turf...and that's aside from the hundreds of parks, monuments, rec areas, and forests that have been set aside. No way to see it all in a lifetime. Road trips give you a fighting chance for making a dent in what we each want to see. The West happens to put a bunch of jewels in a dense area. Lucky buggers, the lot of you, that live out there. I'd move, but alas, I'd miss being able to be at the Gulf in a few hours.