A few years ago while waiting in some office I saw pictures of an amazing waterfall - Grand Falls aka Chocolate Falls.  It's over by Flagstaff.  It only runs when there's sufficient run off during the Spring or after the Monsoons, so catching it is not always easy.  We needed to go and get some rock over that way and since this year has been so wet the falls are going great.  We checked it out and it really is as amazing as the pictures made it out to be!  Fun trip - business and pleasure.