On my first walk, I took a day off in Burgos. It was really great. On my 3rd walk, I had all intentions on taking a day off in Leon, but my body wanted to walk. I arrived early 10:00 as I made it a short day of maybe 18km. So instead of leaving my private room early the next morning, I took my time and left whenever I felt like it. My Camino brother took a couple of days off and bussed up to Gijon to enjoy the sea, food, and simply relax in his own room. After two nights, he returned to the CF and continued as he pleased.
If you are walking further than than SdC, it is great to spend a couple of days there and then go for the sea. Once in Muxia or Fisterra, it's always great to have an extra night after arrival.
No matter what you choose, it's a great choice for the Camino.
Keep a smile,
Simeon