Hiking to bottom of GC (and back) was one of the hardest physical things ever done. Fortunately, a buddy (and couple of lady friends) met me on way up with a cold one. Don't care for the commercialization of the South Rim. Prefer the North. Long drive to get there, but 'roughed it' in the North Rim lodges. Do remember standing in the lodge, with floor to ceiling glass wall, watching a thunder storm approaching, until the rain crashed against the glass. Got a glass of brandy and sat by the fire watching the storm. Marvelous. Anyway, the trails on the North Rim have exquisite views, and not as cluttered with people (as South Rim), speaking in languages one does not understand. Had a contest with daughter to see who could identify the different languages. She won. One old salt told me to come back in the spring with the Canyon runs rim to rim. Had to think about that for a bit, but laughed with him. PS, have heard that anywhere in the world, if one yells "O-H", you're certain to hear "I-O" back. Great place to try.