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If you are staying downtown, then just spend the day looking around the Gaslamp Quarter. No need to go any place else. There are a lot of shop, the Horton Plaza mall, restaurants and the new ball park Petco Park. You could take a walk over to Seaport Village. You could take to trolley to Old Town for about 1/2 the day, but it's not as nice now that Bazaar del Mundo isn't there anymore. Also, I think there is a water taxi that goes over to Coronado Island from Seaport Village, that might be fun too.

There's so many things to do in San Diego. The zoo is great if you are into animals. Balboa Park (where the zoo is located) has many interest museums as well.

There's many romantic beaches and water activities as well. Hotel Del Coronado is a great victorian hotel. You could go order a drink there or enjoy a meal. There's a ferry from downtown San Diego to Coronado leaving regularly throughout the day. You could also rent bicycles or ride a gondola on Coronado Island.

Kayaking through the La Jolla Caves is also fun. There are some great places to watch the sun as well. Great restaurants too!

Have fun!

I was there a few months ago for a few days with the family. There is Sea World, which is an all day pass time. There is also the wharf area where old sailing ship museums are anchored. You can get a ticket to board on a couple of ships and an old Russian submarine. Also Tijuana is a short drive from San Diego. If you prefer not to drive, then there are buses that will take you across the border throughout the day.

The San Diego Zoo is awesome.

I`ve been in SD last Summer and it`s GREAT. The nicest beaches are: Point Loma, Mission Bay, Pacific Beach, la Jolla. I loved these malls: Fashion Mall and Mission. Pacific Beach area and SD downtown have great restaurants... The SD ZOO and Sea World are great too. Try the upstairs bar at Hyatt hotel, the view is great in the end of the day.

There is also the San Diego Zoo and the beach of course.

With just one day:

Walk to coast from downton (or taxi) and see old sailing ship Star of India, have lunch at Anthony's, walk or taxi to Seaport village (also on coast) and shop.

Take taxi to Zoo. If time and energy left, go to Balboa Park (nexto zoo) and see museums, flower gardens, old arhchitecture, etc.

Take taxi back to downtown and enjoy dinner at Gaslamp district (and nightlife if you've got the energy)

Sea world is a place you don't want to miss, that's what I think.....