When I was there a few weeks ago, the front gun turrets were open; you could see the twin 20mm cannon mounts pretty well. That's something you don't see very often.
Yeah, unfortunately, there's not much to the interior museum; it looks like a converted mobile home, so it's not very big. They've got an Allison V-1710 and a P&W R-2800 inside, so that's pretty neat, but other than that there's not much to write home about. The best part of the museum is the static aircraft. The most impressive a/c was probably either the Vulcan (it's bigger than you think) or the B-52D (with a Hound Dog missle under the wing). They also have a B-29 and an RB-50 right in front. They also managed to score an F-14D somehow; usually, museums only have old F-14A's. The gift store is nice but, like every gift store, a little on the pricey side.
Anyway, have fun. One of the best parts for me was landing on the main runway (we flew in on a Cessna 195); I'm not used to landing on 10,000' runways! That thing was huge! We coulda done two or three touch gos all at once on that runway; when we landed, we used up about 1/10th of the runway, and had to taxi a ways to get to the transient parking.