Ding! We have a winner. Michael landed on the island where this was taken. I'd leave it around to see if anyone could get the exact location, but probably noone has run around and explored every nook and cranny of the place since they were kids (except me, obviously!)...
So - this was at the top of Hickory Switch hill, accessed either from the end of the barrell bridge by Autn Polly's or the trail up from Harper's Mill. I'm standing at the base of the waterfall and shooting downwards towards the path below (the wood path at the top of the photo), and just beyond that (cut off in the photo) would be the barrell bridge and the river.
Good job Michael!