I am sorry that I do not have a map to provide, but when I walked through Vigo last summer on the coastal route, the yellow arrows took the route through the city, and entered the city quite a distance from the waterfront (maybe a 40 minute walk). The walk into Vigo was not bad, as a lot of it was through parkland, but it made for a pretty long day. I can't recall exactly who it was, but another member of this Forum has posted that there is a waterside trail from Nigran into Vigo that is marked by green arrows. It would take you into central Vigo along the waterfront. If I had known about that I would have taken it. I will look back at some other threads and see if I can find the original post about this.