This weekend is Open Aircraft Days at March Field Museum, in Moreno Valley: http://www.marchfield.org/
If you're an airplane afecionado, or WWII enthusiast, you really should try to make it to the museum. The have a great collection of aircraft, from 1920's biplanes to SR-71's to MIG's and everything in between.
During Open Aircraft Days, you are allowed to explore selected airplanes in the collection!
Lots of fun for not a big price: $7 adults, $3 for kids.