I’m always on the lookout for cool, free things to do in the city.  I mean, who isn’t? So when I discovered Neighborhood Days at the California Academy of Sciences, I couldn’t have been more thrilled.  Neighborhood Days provides free entrance to the California Academy of Sciences for people who live in a certain San Francisco zip code on certain days of the year.  No matter your feelings about corporations, a big “thank you!” to Target for sponsoring these free days at the Academy.  General Admission on a normal day is $35 per person, making it quite the savings.