Don't forget the Offa's Dyke path! With all the publicity surrounding the Wales Coast Path it is important not to forget that North Wales contains the northern section of the Offa's Dyke path, a recognised national trail which runs roughly along the eastern boundary of Wales. It was built by King Offa of Mercia in the late 9th Century to mark out his westernmost boundary with the tribes of the "Wealah" (which translates as the foreigners). A name which later gave rise to the word Wales. You can find more information in the videos below.
Video 1: Offa's Dyke, the Movie.
Video 2: Offa's Dyke, a local perspective.