Grape Island was once a small but thriving community, and briefly a popular summer resort. In 1941, 3000 acres of Plum Island including Grape Island were purchased by the U.S. government to establish the Parker River National Wildlife Refuge.
The hotel at Ipswich Bluff on the southern tip of Plum Island was a favorite destination of locals in the late 19th Century, who took the steamer Carlotta from the Ipswich wharf with Capt. Nat Burnham.
The Knobbs is a small beach in a stretch of salt marsh on the west side of the Ipswich section of Plum Island. On the Atlantic side was the Kbobbs Beach Life-Saving Station, replaced in 1947 by a camp for children who had been victims of polio.