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When, not if, you get to the Grand Canyon, I urge you to do some of the "unmaintained" trails in addition to the Bright Angel-Kaibab superhighway which most people experience.  You get a different experience on trails like the Hance , Horseshoe Mesa, and Thunder River.  The BA-K is, however, a good introduction to hiking for a long distance downhill at the outset, usually a rather novel experience.  Just avoidstepping in the abundant pools of mule urine (I am pretty sure the pools were produced only by mules....).