My son is studying abroad this summer in Oviedo. We will be meeting up with him once he finishes, flying into Madrid, and then taking the train to Oviedo. There will be four of us, my husband and myself with our 2 grown children. Is it ideal to have a car? We'll be in Oviedo for 3 full days, and would like to explore not only Oviedo, but the nearby surrounding area. Is it relatively easy to navigate around town? How are the road signs, and the roads themselves? Or, should we rely on tours etc? Thanks in advance.