A trip to San Diego would be a great family vacation. Start off in Old Town San Diego, the birthplace of California. There are a number of historic sites to see, food to taste, and shops to visit. Certainly enough to keep you busy for the better part of the day. There is, of course, the beach. Mission Bay is a popular site for water sports. Finish off your 3 day trip to Sea World, San Diego Zoo or the Wild Animal Park. We took the family on this trip a few years ago, and every one had a great time.