We went in late afternoon and took a couple of the tours led by docents. Interesting, but lots of screaming kids on the tours...Did the 3D Mars exhibit which was pretty cool and watched the Mars Lecture/slide show. Then when it got dark we were able to look through the monster telescopes and view the moon and Jupiter. That was worth the trip by itself. My only complaint is that the Rotunda Museum is not open to just go in a browse. There has to be a tour going on or staff inside. We had time to kill waiting for sunset and wanted to go in and look around, but could not. The volunteers and staff were so good. It was very obvious that they enjoy what they do.