I'm at a bench right next to two benches on a little island of a road that veers off from Battery Park City Greenway.  It's directly south of a park but you'd have to swim from the park to get there.  The best way to get there would be go all the way south until you see the Duwane Reade pharmacy then swing up the road that first goes east but quickly curves up and goes north.  You'll pass a museum and two fountains and then you'll want to head east on the next road and it'll lead to Battery Park City Greenway and from there you should see the little curved road that is somehow surrounded by the river.