Took a half day on Friday, and drove down to the waterfall by the Horse Shoe Pass (which is kind-of by Llangollen).
Great idea if you live within a few hours driving distance, hardly anyone there on a Friday afternoon.
The waterfall itself, isn’t really a waterfall (see pic above).
However, it is still really beautiful, especially the view from the hill above the lake/waterfall.
Lots of ‘layers’ of trees, hills, etc.