For a real underwater adventure that doesn't even get you wet, take an excursion in a 100-foot (30.48 meters) passenger submarine. At 160 tons, this air-conditioned giant is decked out with special ports for viewing the coral and sea life as far as 150 feet (45.72 meters) below the surface. Tours depart daily from the pier across from the Hilton. Various cruises are available for booking...