I had a wonderful experience at the Portland Marathon, which is very walker-friendly.
I walked most of the route, but decided to run the last 5 miles.
I was so fresh at the end I could have gone another 5 miles.
(I even got Volksmarching credit! Whoo-hoo!)
There's no way I could have done this 2 years ago. But because of the McDougall Lifestyle (healthy eating, healthy excerising) I was able to complete my first marathon in 6 hours 5 minutes.
Maybe next year I'll do it in 5 1/2 hours????
For those of you who never considered doing a marathon, I never considered it either until last year when I did a half-marathon just for the fun of it. I got bit by the long distance walking bug, and it's been nothing but fun (even when it rains!).