We went mid week in spring which was perfect for trying to avoid a crowd. They offer a terrific membership plan for families, which includes some of the Imax movies, the ability to bring up to 5 guests anytime. It had things of interest for every age, which I've found is rare to find at a science center.
Pros: All day parking $5, Places closeby to eat, close to other sites
Cons: Busy During Summer, Busy on Weekends
more