Try San Diego. By the beach (several), cool at night. Lots to do, Legoland, Seaworld, Embacadaro, The ship "The Star of India", Mexico is not far (but travel there at your own risk, really not safe at this time due to the drug cartels). Del Mar has some unique shops. There is a nice drive up highway 1 or I5. San Clemente is not too far away and would be a nice place to stay also.