How old are your kids? I think that will help in providing answers on which towns to stop in and for how long.
Do understand that "Pacific Coast Highway" does not run continuously through from San Francisco to San Diego. And in some places, like Long Beach, it does not run along the ocean. At Oceanside you have to get on the Freeway to get around Camp Pendleton Marine base. Take a close look at a large map with a lot of detail.
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