Block Island is coextensive with the town of New Shoreham. The island is a popular summer tourist destination and is know for its bicycling, hiking, sailing, fishing, and beaches. The island host two historic lighthouses. Much of the northwestern tip of the island is an undeveloped natural area and resting stop for birds along the Atlantic Flyway. Every summer the island hosts Block Island Race Week, a competitive, week-long sailboat race. Other popular events include the annual Fourth of July Parade and celebration. During these times the island's population can triple over the normal summer vacation crowd. The Nature Conservancy added Block Island to its list of "The Last Great Places"; the list consists of twelve sites in the Western Hemisphere.