I found it:
spotting is very good at "Planeview Park," which is right next to the College Of Aeronautics off of the Grand Central Parkway right at the beginning of Runway 4. It is a wodnerful view of landing planes, but this approach is most often only used in poor weather, so photography is often just as poor. In addition, plane departing on Runway 22 (coming TOWARDS the park) is another extreme rarity due to the closeby residential area. (do a jetphotos.net search for pictures by Dennis Wong, a good example of Planeview Park shots) Inside the Main Terminal is also a great spot for viewing and picture-taking. Anywhere among the windows are obviously very good. At both ends of the terminals, there are escalators that lead you up to a third floor, and a wonderful higher view of Runway 13/31, especially at the southern end of the terminal. (do another jetphotos.net search for pictures by Dennis Wong, for examples of terminal shots) Across Flushing Bay, you have many options in the town of College Point as well. One good spot is at the Herman MacNiel Park, located at the northeast corner of the town. Here you'll have a wonderful view of planes landing on Runway 22 as they pass the NYC skyline (as seen in several jetphotos.net shots by Tom Turner/Cicadajet). The very best spot in College Point, though, has got to be the dock, which is close to the southern end of College Point. It overlooks the beginning of Runway 31, and is a great view for planes arriving on 31 or departing on 13. Approaching planes fly DIRECTLY over your head at about 50-80 feet up, and the height gives you a slightly elevated view of the runway as well. This spot is on private property, so in order to not get into trouble and ruin the spot altogether, jsut email me at firstname.lastname@example.org (or email me for any questions about LGA
spots), and I would be proud to show you the way in. (examples of these can be seen by doing a jetphotos.net search of photos by Phil Derner Jr.)"