Morgan Hill in Easton, PA.
To be fair, I would like to try to walk it someday, but it is on a property with brutal elevation changes. I play quite a bit with an indifferent walker, i.e. he walks when I do, but is just as happy to take a cart. He is quite a bit older than me and would not walk it.
Other than having to ride, it really is a spectacular layout and one of my favorite courses in the northern New Jersey/eastern PA area. It is also the only course I have played in the area that I would play if I were forced to take a cart. I have been close to a few arguments with clubhouse staff at courses where they were causing a stir about my request to walk, even when paying the cart fee.