We will be in SD this Thursday through Sunday. We've been a few times this same time of year and will be staying at the Residence Inn on Pacific Highway from Thu. night through Sat. Then going to the Marriott Marina on Harbor Drive for Saturday night. We've done some sightseeing before (Midway, Coronado Island, LaJolla, Gaslamp, Balboa Park, Las Americas Mall). This time we are renting a car. We might like to do a little shopping, but that isn't a necessity. If the weather is nice we would like to be outside some, even though I'm always disappointed it's too cold for the beach or diving. What would you suggest? We are in our 50s.