Learn Spanish
Did you know that Spanish is the second most widely-spoken language in the world (after English) with approximately 400 million native speakers? You will get so much more out of your trip to Spain, and future trips abroad if you try to learn a little Spanish.
Join a class in your area or try the excellent BBC website www.bbc.co.uk/languages/spanish.
Alternatively "Breakthrough Spanish" is a very good self-teach book with audio cassette.