It's pretty straightforward: start on one side of the GC, run down to the river, run up the other side, ring the bell on top, and go back. There are a couple of options on the south side of the canyon, so depending on what is chosen the route varies between 42 and 50 miles, with about 11k of vertical. Straightforward indeed, other than the fact that for some of us (me) it's almost 50% further than the longest run ever! And the National Park website doesn't really seem to encourage it: "Under no circumstances should you attempt to hike from the north rim to the river and back in one day! Do not hike during the hottest part of the day."
Maybe they meant "don't do it before also going up to the south rim before going back"?
|Heading down the trail pre-dawn|
|I'm sorta posing here; we were going the opposite direction; the south rim is far in the distance|