The cliffs around South Stack Lighthouse offer great variety in an awe-inspiring setting. Thankfully it isn\'t all hard stuff though and you can find relatively friendly routes on Castell Helen, including the ever-popular Lighthouse Arete at VS. But big, bold (and often loose) walls is what most of South Stack is about with some of the most impressive extreme adventure-routes in the UK at the iconic cliffs of Yellow Wall, Red Walls and Mousetrap Zawn.