A nice urban hike. This is a repurposed, elevated freight train bridge that used to run on the west side of Manhattan. Offers nice views of the Hudson River and the New York skyline. Lined with trees and vegetation. It can get crowded on weekends.
The very North of the Park still all woods except the Park's end at 110th. The North Wood's house the Box House an old fort. You take actual wooded trails through it. A couple spots allow for serious rock climbing. The North Woods encompass the area between 105th and 110th Streets on the Western half of the Park. The area should be avoided at night.