I would like to leave Porto on 07/01 and come back the 8th to Porto. I am goint to rent a car and will spend two days in Santiago De Compostela. I want to drive to San Sebastian and I want to get the most out of that trip. Can you create an itinerary for me please?
The north worths a visit, of course!
The itinerary depends on your likes... but I'd say Santiago, Gijón, Santillana de Mar (including Altamira cave, nearby) or Cabárceno (outdoors zoo), Deva-Zumaia coast and San Sebastian.
In your way back to Porto, you can visit Burgos, León or Madrid, for example.
Definitely stop in Gijon or Ovideo Asturias. Have some cider!