An easy walk from Penderyn over Moel Penderyn and passing a decent waterfall you can walk behind.
The GPX follows the available paths as there are no marked footpaths across Moel Penderyn, but the land is free access so we walked up to the top and across the fells.
The Cicerone guide tries to take you adjacent to the river as you head north. We could not find this path, either it no longer exists, or it was well hidden. The Cicerone guide is > 10 years old, so its possible there has been a landslide or something.
This should have taken around 3.5hours, however it seemed to take us significantly longer.