I'm counting on some of you New Yorkers to come through on this. We're going to New York over spring break with our two sons (16 and 15.) They're far from first timers; I think this will be their 10th visit, so they've been all over Manhattan and have already seen all of the obvious sites. Their last trip in was almost 4 years ago, though, and they're interests have changed as they've gotten older. We're looking for some more off-beat things that we can all enjoy. We know we'll go to the high line and Ellis Island (something that didn't interest them when they were younger but does now,) but could sure use some more ideas. Anyone?