At Brussels I recall being able to have a gander in the cockpits of some of the exhibits - Mil 24 springs to mind; Also the Windsor Locks museum, I certainly recall being able to climb up on the P-47 via a walkway and have a peer, whilst at the Hiller Museum at San Mateo one can sit in an A-4 cockpit - tight, or what! I'm quite broad in the beam, but not what you'd call tall - hell of a small place to go to war in. You can also walk/crawl through Kermit's B-17 at Polk City.
Notice that they are all abroad to us Brits?
In terms of info, I've always felt that the info boards at some museums are way too brief. I think a technical summary and specs, a potted history of the type, and a potted history of the individual aircraft on display are essential...