Gentlemen - I've been to many model shops in Germany and I disagree with what Silver wrote. I feel that his generalization goes a little too far and it also contradicts my experience. While nowadays more and more pople are into operating cheap to medium priced RC models and moel shops have to work with that trend, the model shops in Germany certainly differ from one to another. Some of them are focused on RC and may have a very small selection of plastic models or may omit this subject entirely (newer shops do that). Some shops are focused on railroad models and those shops usually have quite a good selection of plastic models and an excelent choice of tools, paints and diorama materials. And there are shops that focus on plastic models too - you just have to look in bigger cities for them, but there are exceptions. One excellently stocked shop is in Waggum - a small village near Braunschweig, Germany - they have an internet shop but let you roam through their warehouse, quite an experience! So I say don't go to Spain, you'll find good shops much nearer. If you want to travel outside of Germany you might try Warsaw or Krakow in Poland - those cities have good modelling shops in addition to cheap beer and nice sightseeing, not to speak of friendly girls, so why travel so far? :-)
Enjoy your stay in Europe and have a nice day
Paweł