Last Saturday we went to the California Science Center. Located at Exposition Park, we were able to have a picnic lunch before visiting the museum. Parking was $8. The kids had a blast, and we were grateful for a fun place to spend a Saturday that was relatively cheap (donations for admission).
The museum has exhibits on ecosystems, technology, weather, all sorts of things. I especially enjoyed the "show" on chemical reactions where I learned a few things I should have caught back in high school chemistry class and apparently did not (ahem). ;) We spent a couple of hours at the CSC and didn't see nearly everything, and of course there are many other museums, such as the California African-American Museum and the Natural History Museum, that we hope to visit in the future. The California Science Center and Exposition Park are fun for the whole family!