When Pres. John F. Kennedy established the Cape Cod National Seashore in 1961, it was acclaimed as the "finest victory ever recorded for the cause of conservation in New England." When erosion and overdevelopment threatened the Cape, the idea of a national seashore took hold, forever protecting this treasured place. The park preserves 44,000 acres of forest, marsh, bog, and ponds, and a 40-mile stretch from Provincetown to Chatham,...