Fort Tryon Park is a nice park located north of Manhattan, on the river bank of the Hudson river. It’s easy to access by public transport, using 190 Street Subway Station. It’s a busy gay cruising area, popular with gay guys from all over NYC. It’s mostly busy on week ends a bit late at night, when the park is really empty. The busiest area are around the top of the park and the god park, that should help you find it. Can get busy with all kind of gay guys, some quite horny coming after a night in the bars. It’s not so difficult to find a discreet place to have fun, especially at night.