Celtic Spain

I hope to spend about a week to 10 days in northwest Spain in early June before meeting up with a friend in southern France. I have never been to Celtic/northwest Spain before and would appreciate any suggestions and recommendations on places to stay and how to get around. In particular, I would like recommendations about guides/tours for the pilgrimage trail, Celtic areas to definitely include, and good places to stay. I will not have a car.
Thanks for any and all ideas.

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