Its a metal fence hidden behind trees and bushes right next to an old mine crater so people wont go there. You can either go there straight from the main road or take the stairs down and then climb up the side of the hill through the trees. If you are worried about someone seeing you from the road you can go further back to where the fence zigzags to the right (hard to explain, look at the map). You are hidden there and there´s plenty of room to do whatever you want.
Is this wall still safe to paint?