Yes, definitely worth it.
Its been 20 years, and I toured the northern coast and the Basque region (Spain and France) on bicycle. Parts were along the Camino de Santiago, more or less. Day drunks in dive bars would buy me drinks (sidra mostly) if they thought I was following the Camino (I wasn't but they didn't know that).
Also made it down to Pamplona for the Running of the Bulls (San Fermin). Check that madness out if you have the chance. Lots of tourists there for that though.
Loved the area around San Sebastian and the northern coast. Very scenic, beautiful country, friendly people. Great beaches. Bilbao is very cool, great architecture. Beautiful little towns along the coast, not very touristy at all (at least back then). The entire Basque region is pretty awesome actually, and the food is absolutely incredible. I'm not a world traveler, but I have been around some, and that area is one of the favorite places I've been to.
People are friendly and gregarious, just don't mouth off about Basque independence in any dive bars. In some of those bars, you are in Euskadi, not Spain.