Luarca is a pretty little fishing town half way between Granero del Burro and Asturias airport. It has some nice shops and sells plenty of typical Asturian produce. It is however probably best known for its wonderful restaurants around the port. They all specialise in seafood and shellfish, but probably the best one is the Mesón de la mar. It is a striking building on the far side of the port, but is worth the walk. Don't eat in the restaurant - it is much more fun in the bar. You can watch the crabs trying to clamber out of their huge tank in the middle of the bar.
It is a great place to stop for lunch if you are on your way back to the airport. You can also have a day out in Luarca without taking the car. If you go to Vegadeo from Granero del Burro, you can catch the Feve train. This is the narrow guage railway that runs along the north coast of Galicia and Asturias. It stops everywhere and is not for anyone in a hurry, but the views of the sea and coastline are spectacular. Click here to view the timetable