I had a great time at the California Academy of the Sciences. The building is beautifully designed, and there are some interesting exhibits. This place is really great for children, and the cafeteria actually has some delicious food. The only downside is that it didn't take me too long to go through all the exhibits and the planetarium. I was only there for about 2.5 hours. However, the academy is in Golden Gate Park, which is beautiful and houses a number of other attractions. I'd highly recommend!