I grew up in SD, so I'm a little familiar with it.
SD is not much of a landscape photography place. My only recommendations would be:
Sometimes when you are close to an area you tend to get bored with the available opportunities, or sometimes local things just seem ordinary to you. Certainly there are places that are more compelling if doing a trip specifically for landscape photography, but there are some nice opportunities in San Diego. I get there frequently and always take my gear along.
Not only is the zoo fun, but the Wild Animal Park is interesting and presents some possibilities. San Diego Harbor, including the unique Coronado Bridge is worth checking out. I've seen some nice shots taken of the moored sailboats in the marina taken on a foggy morning, and several of the sail boats themselves on the water. The trees mentioned at Torrey Pines are also good fog subjects. The San Diego skyline and waterfront is very picturesque especially in late evening or at night from across the bay. The Scripps Pier, while not your traditional pier is interesting to explore. I haven't explored balboa park yet but I've seen some nice images taken there.
As far as Torrey Pines/ La Jolla Cove area, there is a wealth of locations there. My favorite is just south of La Jolla Cove. Sunsets are spectacular, and even sunrises present some nice opportunities.
Here are a few of my favorite from my many visits to the San Diego area ...
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As you can tell I love the sunsets there.
Of course if you don't like seaside and sunsets, that does limit your possibilities. One last tip, I highly recommend this San Diego gallery from one of my favorite landscape photographers, Patrick Smith.
http://www.patricksmithphotography.com/san...-seascapes.html