Take your kids to Blue Mountain Reservation in Peekskill and spend the day outdoors. You can also take them to Croton Point Park in nearby Croton-on-the-Hudson, which is shortly past the train station (you won't have to pay a toll most days to enter, usually only if there's an event). Take them to visit Bear Mountain State Park in Stoney Point, with lots of trails---and there's even an ice-skating rink in the winter, where you'll create lots of fun family memories that will stay with you for years to come.
