If the forecast is looking grim, why not spend your day at The Henry Luce III Centre for the Study of American Culture? You'll be surprised just how many interesting facts you can learn about days gone by here.
This collection of historical artifacts is often on the itineraries of travelers to Manhattan. But The Henry Luce III Centre for the Study of American Culture isn't the only highlight in the area. Times Square, Broadway, and Grand Central Terminal are some other worthwhile attractions nearby.