After watching a stunning Oregon victory over Michigan State, I went to the very northern tip of Manhattan to walk the neighborhood of Inwood. It was about 16 miles, but because of all the doubling back required I think it only added about 11 to the total.
For the most part the residential/commercial blocks of Inwood (the area west of 10th Ave. and east of Inwood Hill Park) look and feel like Washington Heights. The area east of 10th Ave. is mostly municipal warehouses (bus barns and the like) and some food/beverage distributors. Inwood Hill Park makes up the western third of the neighborhood. It contains the last remaining natural forest land on Manhattan and is said to be the place where Peter Minuit bought (more likely leased) the island from the Lenape Indians in 1626.
Along the way I stopped for some food at La Marina, a restaurant at the western end of Dyckman St. It's a nice space, the food is good (and reasonably priced) and you get panoramic views of the Hudson, the Palisades, and the George Washington Bridge to the south. Highly recommend if you're looking for an excuse to make it up to Inwood.