Yes, the subway pass is a great idea (just remember that some of the trains are express ones and don't do all the stops, this has happened to me several times, the last time was on the day i was rushing back to the hotel before heading out to the airport, instead of going to 96th street i ended up at 145th. Oh and if you get the subway to the airport be careful, there are 2 A trains, and yes i got the wrong one, its a good job i'd left heaps of time to get there.) And the Brooklyn Bridge is worth walking across (wear comfy shoes though!). We walked over just as the sun was going down so got sunny views on the way over and sparkly lights and great night views on the way back. You could go see the Intrepid Air & Space museum too, i spent a while going round it looking at all the stuff. And if you like rides n' stuff there was a flight simulator in there that you got to control (was a great laugh just doing lots of loops and spins) If you've got the money you could do a helicopter ride (best to book in advance though). And if you want to see anything by boat do the Beast speedboat tour, a half hour trip down to the Statue of Lib and back, great if you haven't hours to spend on a slow cruise boat. The NBC Studio Tour is also good, and keep your eyes peeled for film crews. Saw a film being made one day, didn't spot any famous people though.