If the forecast is looking bleak, why not spend some time at Fraunces Tavern Museum? You'll be fascinated by just how many interesting facts you can discover about the past here.
You'll be spoiled for sightseeing choice when in Manhattan. Fraunces Tavern Museum is an ideal place to begin here, but there are loads of other worthy places to consider. Times Square, Statue of Liberty, and Broadway are close to the collection of historical artifacts and will top off your day nicely.