In reply to Anonymous:
Slate - Bus stop, Vivian, Rainbow slab and Colossus wall are all ok to visit but not sure about the rest of the quarries. So if your not sure i guess its better to stay out.
Gogarth - Dont know how dirty Red/Yellow walls or Mousetrap Zawn will be, but i guess there is still a lot of birds about and a lot of Poo.
The main cliff, Wen Zawn and the other areas should be fine.