The New York City graticule is at latitude 40, longitude -74. It includes most of New York City (minus the West Village & Chelsea and downtown Manhattan -- who needs 'em? -- and extreme western Brooklyn) and a whole hell of a lot of Long Island. (If only over half of our graticule wasn't over water)
Activities
Oleo will try to get to the coordinates, but doesn't have a car.
There is a facebook group for New York, NY geohashers. http://www.facebook.com/group.php?gid=19859510038