Photo by Travelpod
This free museum is often overshadowed by its bigger named neighbors, specifically the Natural History Museum and USC. But to skip over the California Science Center would be a mistake. Not only do you have cool kid friendly permanent exhibits that highlight the life, chemical and physical sciences, but you also have an IMAX theater (Go to Under the Sea 3D! Freaky.), amazing visiting exhibits (who hasn't seen Body Worlds?), and a rose garden out back that would make any grandma swoon.
If you've got only limited time, a must see is the giant robot man in the Life Sciences exhibit. I don't know how to describe it other than you enter a theater and get to see this giant robot guy show you how the body works. Weird? Definitely.
Walking around the center can stir up quite an appetite, so after you learn all about your body and how to keep it healthy, you can go to Mickey D's on the lower level and stuff your face with fries.