I did it!
This is me very near the end point of a Waimea Canyon trail. I went to the end of the trail, but this picture is the highest elevation. To give you some perspective, I am standing over there.
Over there. The big brown hill to the left of the waterfall.
It's only a couple miles away, really.
The end point was the tippy top of the waterfall. Totally worth it, but beware the faint of heights.