Leisure Knoll is a private, adult, 55 and over community located in Ridge, NY - a part of Brookhaven Township on Long Island. Established in 1972, Leisure Knoll is a not for profit Home Owners Association with 701 single family ranch style homes, a recreation center, craft center, and outdoor facilities including a heated saltwater Leisure Knoll is a private, adult, 55 and over community located in Ridge, NY - a part of Brookhaven Township on Long Island. Established in 1972, Leisure Knoll is a