I haven't ridden the entire trip myself either, but I have driven portions and ridden other portions. 2 big things: I seem to recall reading somewhere that one of the most popular books significantly underestimates elevation gain at some key points. Something to keep in mind - if my brain manages to recall where I read that, I'll post it. Secondly, be aware (if you aren't already) that the parkway is non-commercial. This means that you'll often have to go off the route by several miles to find shelter which may mean climbing up a rather large hill to get back on the parkway.

Otherwise, enjoy! It's some beautiful riding. And it's nice to not have all of the commercial traffic.

Carrie Anne