Mission Bay Park is San Diego's monument to sports and fitness. This 4,600-acre aquatic park has 27 mi of shoreline including 19 mi of sandy beaches. Playgrounds and picnic areas abound on the beaches and low grassy hills. On weekday evenings, joggers, bikers, and skaters take over. In the daytime, swimmers, water-skiers, windsurfers, anglers, and boaters—some in single-person kayaks, others in crowded powerboats—vie for space in the water.