Just a quick note. Before I left Tucson I visited Kitt Peak, the only National Observatory in the United States. You can go to: http://picasaweb.google.com/douglas.palosaari/KittPeak# to see the rest of the pictures on my picasa site. The daytime tours are very basic. I would suggest just getting the audio tour and walking around on your own. I'm sure the evening programs are very good.
For more info on Kitt Peak, go to: http://www.noao.edu/kpno/ check out the image gallery.