Science museums are always great places to take kids and the Exploratorium is no exception. They have a wide range of exhibits that appeal to (and can be understood) all different age groups. I'm particularly impressed with their living plants/animals displays and some of the newer interactive/computer exhibits. I often find myself more interested well after the kid I'm with gets bored. Some of the displays are getting a little worn down and it would be nice to have more staff around to help talk about some of the displays, but you have to love any museum that encourages you to touch.
more