Monday I went up Booby Wagner Walk (the East river walk north of 89th St.) Ward's Island Bridge, all the way around the island, and back down the Wagner Walk, about five miles in all. It was pretty quiet, although I did see a Red-Throated Loon in the east river west of the island, my 74th species in New York County this year.
The salt marsh at the north end of the island was full of Song Sparrows, and I saw an odd dark flat-headed sparrow who flew into the rocks with some Juncos and disappeared. Not sure what that was. It didn't reappear in the half-hour I watched the area.