Open year-round, dawn to dusk. Lifeguards on duty from late June to early September. Nantasket Beach has been a popular summer destination for city dwellers since the middle of the 19th century. The reservation encompasses 26 acres along one and a third miles of oceanfront. The historic Paragon Carousel evokes memories of the area’s amusement park history. Band concerts and public dance lessons are popular summertime events.