This isn't limited to Southern California, but there are about 10 museums in the area that offer free admission on the first weekend of the month to a Bank of America cardholder.
There's a place - new this year - called MUZEO, which I'd never heard of, but is of interest because it's in Anaheim - doesn't that city have some other tourist attractions?
Not far away is Discovery Science Center. The Autry Center is also part of the program. Photos from these two museums are in this thread.
There's a place - new this year - called MUZEO, which I'd never heard of, but is of interest because it's in Anaheim - doesn't that city have some other tourist attractions?

Not far away is Discovery Science Center. The Autry Center is also part of the program. Photos from these two museums are in this thread.