ok, here are a couple new crops and adjusments.
Keith, they're all strong compositions. I'm not sure there's a right or wrong answer. Personally, I liked the original uncropped version better than the first crop you posted. I also like the second crop you posted, where you basically got rid of some of the foreground.
As for the person, I tend to like my landscapes without people in them. But the person does add a nice sense of scale, which is totally missing otherwise. Without the person in there, I would never have guessed the falls is as big as it is. So again, the image works either way (and in different ways) with and without the person.