Spectacle Island is a 114-acre (46 ha) island in Boston Harbor,[1] 4 miles (6.4 km) offshore of downtown Boston, Massachusetts. It is part of the city of Boston. The island has a varied history, and today is a public park with a marina, visitor center, cafe, lifeguarded swimming beach, and five miles of walking trails,[1] forming part of the Boston Harbor Islands National Recreation Area. It is served all year by ferries from Boston, and on weekends and summer weekdays by a shuttle boat to and from nearby islands.[2][3]