Grand Canyon.  Tiny things along with the pathway is people.  It was tough hiking.  I did not climb up mountains but went into canyons.  It was easy to go down at first.  1.5 mile was a piece of cake, but climbing up 1.5 mile was different story.  Cloudy weather was good for hiking, keeping me cool, but it became sunny which made me hot.  I am a lucky guy.