First, let me tell you that it is always fun to go to places where you have to try speaking another language. If you are not going alone, it will be fun.
1. Make some cards with phrases written in Spanish and English. This helps a lot.
2. Have with you a small notebook to sketch if needed or write information.
Ok, some words and phrases for you:
Agua - water
Por favor- please
Gracias - thank you
Como llego a... - How do I get to...
Tengo hambre - I am hungry
There is a wonderful hub regarding pronunciation that can help you a lot: Spanish Lesson- Alphabet and Pronunciation
Wish you the best - te deseo lo mejor