I agree with an earlier post, that a great walk has a lot to do with other factors. Great golf course, great views, history, played great, etc.
Some of my favorites:
Seminole (Could play it every day)
SFGC (Played like Ray Charles, but still enjoyed the walk)
CPC (Wow)
Lahinch (Finished the walk under moonlight with a bag full of empty Smithwicks cans)
Columbia Country Club (Maryland)
Burning Tree Club
There is a great old Donald Ross in Hagerstown, MD called Fountainhead. Two steps off of the green and you are on the next tee. Loved it. As someone mentioned earlier, old course-usually a great walk.