If you are a tourist, you could drive with the valid US license for as many as 6 months. However, if you propose to remain for a longer time, you will need to secure a Spanish license—which is what I got down to do. El canje del permiso de conducir https://jeffreysyaej.ltfblog.com/32888713/permiso-de-conducir-en-españa-can-be-fun-for-anyone