Hi S.,
Every community has preschools in it, so I'm not sure where in SoCal you're located, but I do know that there are several really great local preschools in the San Diego region. With preschools, there is no 'one-size-fits-all' solution. Your child and you have to go to schools, talk to teachers and administrators and find out what works for you both. Location is also key. We spent a great deal of time looking for a school as our nanny was moving and we had no choice but to find a place to take our daughter. After visiting countless places, we found one in our own neighborhood, less than a mile from our house, that is an absolutely amazing place. They are three facilities thru/out San Diego county, and are very 'education' oriented, though thru play techniques. Our daughter has changed immensely for the positive by attending this school, and has learned a great deal. We are exceptionally pleased with our school, but have talked to others who have not been pleased. So, again, what works for one family may not work for another. It's all in the chemistry between you/your child and the school, and what they offer that 'speaks to you'.
Good luck! Cheers, C.