We pre-purchased our tickets before our trip, so we had them available in our e-mail to scan upon arrival. We got tickets (free, part of admission) to both tram tours, which were interesting and informative, but warm (they are open-air and outside); however, there was some missed information because the tour guide's words were garbled over the awful speakers. We walked around reading everything inside too, which was cool (in terms of both temperature and neat floor plan); however, a bit outdated. The most interesting part was walking into and exploring the exhibits inside the 747 plane and space shuttle on top of it. We spent 5.5 hours here, from 11:00 to 4:30.