Here is a picture of the Canyon floor near the Phantom Ranch. It depicts Bright Angel Creek as it flows past the Ranch into the Colorado river. Built in 1922, the Ranch provides dormitory/ cabin space and food for hikers, mule riders, and river rafters. We stayed in a cabin with five bunk beds.
I spent my free day at the ranch reading a book, soaking my legs in Bright Angel Creek, and taking as much Ibuprofen as possible.
The people who work at the Ranch spend a lot of time preparing you for the return hike. First, they repeatedly chant, "Going back up is much easier than coming down". Then they feed you lots of carbohydrates, salt, etc. to prepare your body for the upward assault. Finally, they make sure you understand that the only way you are going to get helicoptered out is if you're dead.