Fire Islandhttp://www.fireisland.com video of Ocean Beach, Fire Island. Memorial Day weekend 2008. Fire Island, New York, is a barrier island http://www.fireisland.com video of Ocean Beach, Fire Island. Memorial Day weekend 2008. Fire Island, New York, is a barrier island, approximately 30 mi (48 km) long and 0.5 mi. (1 km) wide, in Suffolk County on the southern side of Long Island. Approximately 820,865 people visit Fire Island beaches each summer.