I beat Katie Holmes by over an hour at the NYC Marathon, which I think is awesome (in part because I assume she has access to trainers and such that I don't have!). Amazing experience, but I wouldn't make running my sole extracurricular. Too solo (obviously). Everyone around you at the finish line is concerned with themselves, and not that excited about your accomplishment as a group.
That being said, I'm wearing my medal to work tomorrow. And did enjoy the random congrats from strangers on the sidewalk in NY.