Yes not a problem for you as said before Fuentes De ok but there are a couple of sites you will pass on the way which are really good and have great views over the area. The cable cable at Fuente De is a must.
Love the Picos Europa region. Last visit 2 years ago, it snowed in June, not kidding. We hotfooted it across Spain to Tarragona.
If you get a chance visit " Guernica" Near Bilbao, where Franco used the Germans and Italians to Bomb his own people and wiped out his opposition.
You will have no problems and the place is stunning. There are campsites, aires and places to park everywhere. Visit riano for one of the best views in Europe, can his for cheese, walk the gorge, do the cable car. Potes has one of the best campsites in Spain. Roads are a little narrow and twisty but in great Nick. All the info you need is on our blog. Www.eamlesstravels.com
Went to Portes and stayed for a couple of nights in May it was chilly at night so might be a bit cold now. Well worth the time to get there from the coast and an interesting drive up the valley We were in a PVC and that was tight in places especially off the main road.