The South Rim is 7000ft above sea level, an altitude that for most people is fatiguing in itself. Furthermore, all hikes start with a long, steep descent - which can come as a shock to the knees - and unless you camp overnight you'll have to climb all the way back up again when you're hotter and wearier.
If you're day-hiking, the golden rule is to keep track of how much time you spend hiking down, and allow twice that much to get back up again. Average summer temperatures inside the canyon exceed 100°F; to hike for eight hours in that sort of heat, you have to drink an incredible thirty pints of water. Always carry at least a quart per person, and much more if there are no water sources along your chosen trail. You must have food as well, as drinking large quantities without also eating can cause water intoxication.
There's only space here to detail the most popular trail, the Bright Angel . Many of the others, such as the Hermit , date from the days prior to 1928, when the obstreperous Ralph Cameron controlled access to the Bright Angel and many other rim-edge sites by means of spurious mining claims, and the Fred Harvey company had to find other ways to get its customers down to the Colorado. These other trails tend to be overgrown now, or partially blocked by landslides; check before setting out. -- location id = 42158 -->
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Into the Canyon Getting to the Canyon