The obvious ones are the Beaches, Mission Bay, San Diego Bay, Sailing, taking 3/4 day fishing trips and catching Yellowtail, hiking along the coast (sunset cliffs, Torrey Pines reserve), Golf courses (e.g. Torrey Pines), Whale watching from Point Loma Lighthouse, taking kids to Sea World, Zoo and Wild Animal Park (off-season of course), taking trolleys to baseball and football games, Karl Strauss, taking the ferry to Coronado and renting bikes, good Mexican food, Del Mar Fair, No bugs
This is what you see in every tourist book, but what about what the locals know that you can’t find in a tourist book. This stuff is nice if you are visiting San Diego, but doing this every weekend gets boring fast.