Visit Del Mar, absolutely beautiful area and Torrey Pines State Park, drive north on the PCH, beautiful scenery, keep going as far as you feel like it. Day trip to Bug Bear is fun, also a beautiful drive. Cars and coffee events in the area and Donut Derelicts in Huntington Beach on Saturday morning is great but a decent drive to get there from SD. Day trip to La Jolla is nice too, Dukes is a great seafood place for lunch or dinner there. Old Town is pretty cool to walk around ion too. The Auto Museum and Balboa Park plus the arboretum is really nice. SD Zoo is always fun.