Exchange your currency for local currency. Use this to shop with so that local merchants will not rip you off when you are paying for items.
Get help finding a type of store by saying, "De donde esta la tienda ...?" Complete the end of the sentence with the store type. You can look up the word for the store in any translation book.
Ask how much something costs by saying, "Cuanto cuesta esto?"
Find out if they take credit by asking, "Usted toma tarjeta de credito?" Then hold up your credit card to see if your type is accepted.
Stop someone and ask where the restroom is by saying, "Donde esta el bano?"