We went from Cundon by train to Barreda then we walked from there to Santillana del Mar 6km or so.
We dropped our bags at the hostel, and walked around, sat and had drinks, did some sightseeing, had more drinks, went to the pharmacy for foot remedies, and went for lunch at two, with drinks. Dinners at 8, more drinks and then bed at 10pm. The second map is us wandering around town.