This company (formerly known as San Diego Harbor Excursion) offers daily 1- and 2-hour narrated tours of the bay. There are two 1-hour itineraries, each covering about 12 miles. The south bay tour includes the San Diego-Coronado Bridge and Navy shipyards; the north bay route motors past Naval Air Station North Island and Cabrillo National Monument. The 25-mile, 2-hour tour encompasses the entire bay. Two-hour Sunday (and Saturdays in summer) brunch and nightly dinner cruises are also available. In winter, whale-watching excursions feature on-board naturalists from the Birch Aquarium.