I got up at 4AM to drive to the North Rim and begin a 17 mile loop hike (with 4400' vertical down and up) across the Ken Patrick Trail 4 miles, down the Old Bright Angel Trail 6 miles, and 7 miles up the North Kaibab Trail back to the truck. This took me 8 hours total, including all breaks. The temp at the rim was 50'ish, and down at Bruce's house it was 90. It was a hot hike out!
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From the rim looking down the Old Bright Angel Trail, which is not maintained at all. It was brushy, steep, and ledgey in many places.
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Near the bottom, I walked on ledges above many pools and waterfalls.
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I came 18 inches from stepping on this aggressive pink rattler! I was on a narrow ledge and almost slipped off of it into the above photo's pools.