Tarrytown is about 40 minutes from Manhattan.
For those interested in exploring the surrounding Hudson Valley area, below are some recommended sites:
Foliage viewing (aka "leaf peeping") Mid to late October is generally peak foliage season. Check here for up-to-date details on foliage conditions.
US Military Academy at West Point
Lighthouses
Hudson River Cruise
Hammond Museum and Japanese Stroll Garden
Rockefeller Estate Hyde Park Philipsburg Manor Sunnyside Van Cortlandt Manor Lyndhurst