We had a great day at the Exploratorium last year - for free! Smithsonian Magazine's Museum Day made is possible, and they are doing it again on Saturday, September 26th. Download an admission card here, and get into museums like Hiller Aviation Museum, the Exploratorium, Contemporary Jewish Museum, Bedford Gallery, Blackhawk Museum, Chabot Space & Science Center, and others.
The card is good for you and one guest - one card per household. California museums are listed here.
Don't forget to enter Frisco Kid's Leapfrog Tag Reader System giveaway - $78 value!