I just got back from Mexico. It’s one of the few countries that is open to travelers arriving from America. If you know a little bit of Spanish down there, your interactions will be much more pleasant.
I’ve mentioned the language site Fluent in 3 Months here before. It’s a great language reference. They posted a very thorough article last week covering Spanish greetings. If you learn most of these you will be able to start communicating with the locals in their own tongue. Check out the article below.
If you are more proficient in Spanish, or are just looking for some more spicy Spanish phrases to learn, you may want to read Live Lingua’s Guatemalan Slang Terms.
Beyond these articles, if you would like to learn a language in a more structured fashion, I would highly recommend the Pimsleur audio language lessons. I’ve used their Mandarin, Arabic, Portuguese, and Spanish lessons with great success.
Some of the above links (from Amazon.com) are affiliate links. As an Amazon associate I earn a small percentage of the sale price from qualifying purchases.