I'm a new Yorker, And this looks like Washington Park, near NY University. A hubbub of activity. If you want lots of grass, you could go to world famous Central Park with is woods and such. Plenty of parks like that.
Frankly the problem with the photo in question is not the city, but the photo itself. We photographers know you have to isolate. The shot covers too much clutter making the place seem univitable. Too many leaves. The over exposure of the picture adds to the clutter. These are just people relaxing at lunch on a warm day sunning themselves where they can, a normal Big Apple activity. A young girl, a couple of older people napping having taken their shoes off, a guitar player strumming a tune others can listen too, etc. The stuff goes on all over the city; always something going on which makes people want to see it. These are not bums and the place has fallen leaves not garbage. The photo doesn't show the joy and contentment these people are actually feeling. That's the photographer's fault, not New York City.