I once, in 1987, when it was illegal to do so, flew THROUGH the Grand canyon. We had been flying north up the Little Grand canyon, and without us knowing it, we had flown all the way up to Lake Powell right down in the canyon! It was spectacular! We then landed and skinny dipped in Lake Mead!!
Its been quite a few years since I was there but one thing I can tell you is to guard your food. I was amazed at how a squirrel just climbed up this lady's body to get to her ice cream. They were so use to people that they had absolutely no fear.