Don't miss the West Harlem Piers Park at the end of 125th Street near the new extension of the Columbia Campus. It has the most breathtaking views of the Hudson River and the Palisades, the coolest breezes on a hot day and a nice place to sit down.
There is some interesting art work in the park that you should see and it is a nice place to take your lunch and eat it by the river. It is just a nice place to relax and enjoy the views.