That brings a lot of happy memories back to me Hollins, as many years ago I lived a 10 minute drive from Llangorse Lake and it is a very scenic area. If you enjoy reading there is a book called The Winter Witch by Paula Brackston who is a wonderful storyteller. It is set in that area about a Prince Brynach that lived in the Crannog on the lake.
As for Hay on Wye and Hay Castle it too is a very interesting town, a bookworms paradise. When I lived nearby a local entrepreneur and bookshop owner who also owned Hay Castle proclaimed himself King of Hay and we had a fantastic firework display set to the 1812 overture. The whole area was so beautiful and we enjoyed our time there very much.