West Indian people appreciate you taking time out to be polite when dealing with them. When you interact with someone, try saying "Good Morning" , "Good afternoon" or "Good Night" as the time merits it. This usually brings a smile people are usually more easy to deal with and it puts them in a friendlier mood.
Remember to drive on the left! If you ask for directions, be prepared for some strange responses. At one hardware store, my wife was directed to try 'East End' next to the two speed bumps by the Catholic Church. Another time we got 'One block past the bridge'. There are very few named streets outside of town, and even then most people don't know them.