We didn't sign up in time to participate "officially" (no t-shirt and no number, etc.) but we still walked the course with what seemed to be about 100,000 people! It is a great cause but as usual it was a bit of a mess, cars on the course, tight spaces, long lines - sort of strange that you can prepare for a year for an event like this and have it seem so unorganized... but it was still fun. And some good exercise.
