Can't wait to go back to the states next year..
I would give you advice as to what we did, but as we don't have to allow for children in our plans, it is totally different to what your needs would be.
I loved LA though, most people I know that have been, or people that talk about it, don't like it?, but we loved it. Did a city day tour, so much history to learn about there, loved walking around Hollywood day and night, we stayed on sunset Blvd., loved Santa Monica pier, and Venice beach. Went up to Malibu. We also did universal studios which was good.
Have fun.
Edit,
Agree with previous comments, SeaWorld in San Diego is the same as Gold Coast, only they have a whale there. We also loved San Diego, spent a few nights there, looking over navy ships, great food in the gas lamp quarter, and went over the border also, ( wouldn't bother doing that again). Can't comment on San Fran, as that is part of our next trip, hopefully.