The California Academy of Sciences---Free!

The California Academy of Sciences is home to the Steinhart Aquarium, a Planetarium, a Natural History Museum, AND AN INDOOR RAINFOREST! Before its makeover, admission was 15 bucks, but they have raised prices to defray some of the costs of remodeling. Admission is now $22 and change. Except for tomorrow, September 27th, when it will be free to get in, in honor of the Academy's reopening. The park, which is located in Golden Gate Park, is featured in this excellent article in the Contra Costa Times.

Computer History Museum

This museum has a reputation for being fascinating, even for non-binary types. I have it on my list of places to take my husband--they even have an Enigma encrypting device. Best yet, it's free.