A knowledge of Spanish will enrichen a trip to Spain, but you can get by perfectly well with English in the major destinations. Spaniards are in general friendly and tolerant towards foreign visitors.
Here are some useful phrases in Spanish:
hola - hello
buenos días - good morning
buenos noches - good evening
buenos noches - good night
adiós - good bye
por favor - please
gracias - thank you
perdón sorry / excuse me
Una cervesa, por favor - One beer please
Otra de lo mismo - Another one please
La cuenta, por favor - The bill, please
Soy vegetariana/o - I am a vegatarian
Busco un hotel barato? - Where is a cheap hotel?
Dónde esta la estación de autobús? - Where is the bus station?
Dónde esta la estación de tren? - Where is the train station?
Dónde esta los servicios? - Where is the toilet?
Hablas ingles? - Do you speak English?
Sí - Yes
No - No