Sounds like such a great adventure. My newest running friends really want to run a R2R2R. One of them did south rim to north rim and she really wants to go back and do the whole shebang. I don't think I'll be joining them in that endeavor! Apparently there are all kinds of crazy folks that run it. Craziness.

I would like to hike R2R2R someday, though. I've never been down there in the depths of the canyon!