hi Pwecious! i'm from San Diego. A couple recommendations:
-La Jolla Cove. great place to walk along the park and watch the seals on the beach from the water walkway, see kayakers. There's also a "Cave Store" where you can pay $4/person to walk down a man-made staircase underground into one of the caves that open into the ocean. Great place! you can wave to the kayakers, maybe see some seals swimming around. anytime during the day is great for the Cove.
-Sea World/San Diego Zoo are classics. there are fireworks every night at 9:00pm at Sea World. they can be seen at the park and from Mission Bay, great place for bike riding, water sports, and picnicking.
-take a walk to Seaport Village, its right own the street from your hotel. Great little shops, a beautiful walk to the Embarcadero Park, which is surrounded my the bay & boats.
-Coronado Island. drive over the Coronado Bridge, (great views of Downtown San Diego), and check out the historic Hotel Del Coronado. its so quaint and lovely, and the backside of the hotel opens up to the beach! I swear this beach has the best sand in San Diego, i wonder where they brought this sand from! LOL. They have a great outside patio area where you can buy an alcoholic drink, grab a table overlooking the beach, and sit out in the sun and people-watch.
Balboa Park is lovely if you like museums. My favorite are the San Diego Natural History Museum & the Museum of Man. the entire park have great spanish mission style decor, a lovely koi pond, and a very nice botanical building. last tickets for the museums sold at 5pm.
Restaurant recommendations: Phil's BBQ on Sports Arena Blvd. Casual atmosphere. Reeeally good ribs with DELiCiOUS sides. my favorite are the macaroni salad & baked beans & cole slaw. also have onion rings (TDF!!), fries, corn on the cob, etc. I recommend the full rack of ribs (comes with 2 sides), the 3-rib tickler, or the BBQ Broham (pulled pork sandwich w/ coleslaw). Very reasonably priced, between $7-18 for full rack of ribs.
i was actually just at Extraordinary Desserts tonight! it was very good! my favorite dessert was the cheesecake covered in berries. definitely do dine-in, they decorate the plates with rose petals and delicious sauces. nice ambiance over candlelit tables.
i agree with eventuality, Yelp is a great website to get more ideas of things to do. Hope you have a great weekend here!