Head west young man! The Cantabrican mountains south east of Santander are beautiful - similar to Austria. The Picos de Europa area is particularly beautiful. I recommend a small town called Potes (co-incidentally, about 10km south of Panes!). If you then go west, you can visit the amazing Santiago de Compostela (the end of the Way of St James pilgrim's route). Then head south and down into Portugal. visiting Oporto, Coimbra, Obidos and Lisbon.
Then head down to the Algarve, via the wild west coast road, to the Algarve for some sun.
Contrary to what many people think, the Algarve is not all highrise hotels and tourists. The area west of Portimao across to Cap St Vincent in particular, is magnificent.
Anyway - wherever you go, have a great trip!