Hi, Torrent,
What I meant about the oceanside walking was that if you go Santiago - Muxia - Finisterre (and stop in Finisterre) you will take a different route than if you go Santiago - Finisterre - Muxia (and stop in Muxia). Santiago - Finisterre goes across the headlands from Hospital and then down to the ocean at Cee/Corcubion, and along the water to Finisterre. From Finisterre to Muxia you head north on a basically inland route.
If you walk Santiago to Muxia first, you will not have that ocean segment from Cee/Corcubion because you will turn off from the road to Finisterre at some point close to Hospital. Then into Muxia, which is to the northwest, then down to Finisterre, thus not coinciding with the oceanside path.
If you do the complete circle Santiago - Finisterre- Muxia - Santiago, you will be oceanside for those 8 or 9 kilometers, either when you go from Santiago to Finisterre or from Finisterre to Santiago, just depending on which direction you are going. I don't know if this makes sense, let me know if not. Buen camino, Laurie