I've lived in California for most of my life! It's full of beautiful girls wherever you go! North or South can make a difference. I tend to find the better looking broads in the South end. The great thing about California is diversity. You will have a wide selection of races to choose from. Latina, Asian, Black, European.. They've got it all!
Places like L.A. and San Diego will always be filled with hotties.
During the summer months it will get extremely hot! Have fun hitting up the beaches and the swimming pools my friend!
At the university you're bound to find a ton of girls!
No idea about what kinda clothes you got in your small city, but dressing nice is always good; especially around the trendy Cali hotties. Maybe find yourself a job during the summer if you need the extra cash, and prepare your wardrobe for when Uni starts.
Good luck! Hope the move goes well!