New York Business Trip

[winnieb]

Ok all you NYC and familiar with the area GC'ers-- I have a business trip next month to the Northeast. I am flying into the White Plains Airport on a Sunday night. My flight arrives at 836pm--- I will be taking the hotel shuttle to the hotel.... and won't have a car. But I don't want to be stuck in the hotel all evening by myself.
SO--- can I take the train into the city-- what do I do by myself on a Sunday night-- how late can I get a train back to White Plains?
Is there anything to do in White Plains? I looked online and it looks like a cute little town that will be closed by 5pm!
I will need to up and out of the hotel by 6am the next morning, as I am riding with one of the VPs to Mass to train some of the people in our office there, the next day to CT, and back to NY to training the office there and home on Thursday. Sunday night will be the only couple of hours I will have.
Thanks alot for your help!!!!
w.