There was a "warbirds" museum in Florida, near NASA, they had a working C-47 you could get a ride in and they'd fly you over the NASA facility, and you could look down on the VAB. Pretty cool. We have a pretty good little Museum of Aviation out on Long Island's south shore, near Babylon. Ironically, I live right next to Teterboro, and they have a museum, but I've never been to it. There's a "History of Spaceflight" near Alamogordo NM that I'm planning to visit when I get some free time... And of course, I have been to Dayton and that was Mind-blowing -- much bigger than Smithsonian. I don't think you can do Dayton in a single day and take it all in.