Before you get slammed here, I'd repost with a more descriptive title. "Not really sure" is perhaps the worst I've ever seen on fodors. "New York-train ride up the Hudson?" may be better! You'll get MUCH better responses!
i responded to your other. i would take the ny waterway up the hudson. you can look at their website to see the several tours they offer and perhaps one will work for you. i ride the ferry to work every day and find it is a peaceful way to get from one place to another.
I assume you're coming here in the near future. If so, it's not the best time of the year to tour the beautiful Hudson Valley. Yes, there's lots to see, but the cold weather season is not the time to do it!