If you like to shoot at night. The convention center is a cool building to shoot at night. And there are some shipping ports running 24-7 just south of the convention center. You can shoot from accross the water close to the convention center. There is also Palomar Mountain state park (http://www.parks.ca.gov/?page_id=637) there is an observatory at the top (http://www.astro.caltech.edu/palomar/).

D.