LSUguy,
Welcome to the California Forum. There are some good crappie fisheries in San Diego. I like to fish Lake Henshaw, El Capitan Reservoire, or Lake Hodges for nice slabs. I have heard that Lower Otay produces some good fishing but have not fished there yet. In the Temecula area to north is Lake perris which I have heard produces some good crappie fishing but I have not been there yet. CrappieShocker or Ledhead may be able to fill you in on that. Check back here before you come out and maybe we can let you know where is producing at that time.
Happy fishing!
Milo