Take I-80 in PA towards NJ, exit 209, follow that until you hit Falls Rd.
Bring a clean cloth to wipe your lens with, they can get wet easily.
Bushkill Falls, located in Pennsylvania, is one of the best undiscovered gems in PA. It seems that almost no one knows about it, yet they call it the Niagara of Pennsylvania. It is, by far, the most peaceful and breath taking places I've ever been.