Santiago to Finisterre and Muxia
Stages are long with rare intermediate stopping points for lodging, food, or even beverage on the way to the Atlantic. Fellow pilgrims are likely to be the hardcore who wanted more after walking for over a month to Santiago. New pilgrims might find it hard to fit in, but you would get some great stories about what you missed, or why you should have done more.
On the other hand, in the last 100 km of the
Camino Frances, new pilgrims are common, so they have a lot in common. It is the "real" Camino, so provides the most shared experiences, even for those who have not walked from France. Alternative caminos, with the possible exception of the
Portugues, have many fewer pilgrims, and those pilgrims may be consciously trying to avoid pilgrims who are doing just a short pilgrimage. Do you want to walk with those who do not want to be walking with a lot of others? If so, consider the alternative routes. If you are less agoraphobic, stick to the
Frances. If you really want to be alone and don't care about arriving in Santiago, go to France and walk the Via Tolosana, Via Lemovicensis, or Via Turonensis. You may go a whole week without meeting a pilgrim!