Lions, tigers, and bears, oh my! What kid doesn’t love animals? Grab this $59 Family membership deal for the Oakland zoo which is normally $99. (Look at offer for details about restrictions and limitations on this offer.)
I absolutely love the Oakland Zoo (http://www.oaklandzoo.org/site/) which is tucked conveniently in the Oakland Hills off 580. I really like it more than the San Francisco Zoo which I find too cold too often to be that enjoyable. You do get a bit of a work out from walking up and down the hills though. There is a play area for the kids and rides (ticketed separately). Open year round except Christmas and Thanksgiving.