On the California Academy of Sciences Facebook page:
Do you live in zip codes 94110, 94114, 94117, 94127, 94131, or 94132? We invite you to come to the Academy – for free! – this Friday, Saturday and Sunday. San Francisco Neighborhood Free Days are generously sponsored by Target.
Forest Knolls is of course in 94131, and if you aren’t a member of Cal Academy, this is a great offer. They do these free days from time to time. It’s limited to six kids per adult, and both photo ID and proof of residency are required. (A driving license will do both.)
(We wrote about Cal Academy free days in more detail back in April 2013.)
This time, the free days for our neighborhood coincide with Hardly Strictly Bluegrass music festival in Golden Gate Park, so traffic will be heavy and parking tough. The next neighborhood free day will be in Feb 28 – March 2, 2014.
If you’re planning to go, here’s the relevant page on their website.
FOREST KNOLLS NEIGHBORHOOD 
Thank you for posting this! We had a great time!!
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I’m so glad! I love the Cal Academy – I’ve been a member for some years and used to visit the previous one even more than I do this one.