Learn French. The French spoken in French Polynesia, a string of Islands in the South Pacific, including the well known island of Tahiti. The island chain was colonized by the French in the late 19th century, and therefore speaks the French language. While French Polynesians may have a variant accent and cadence, it is still principally the same language as that spoken in France. I is still je and you is still vous, good day is bonjour, and goodbye au revoir. If you speak French or intend to learn to speak French before traveling to French Polynesia, you will use the same spoken French taught in any course. Dialects are variant and make understanding spoken French somewhat more challenging at times, however it is the same principle as what separates British English from American English, dialects are influenced by culture, society and location.
Incorporate Tahitian. The vast majority of French Polynesia speak French, as it is designated the official language of government and business. It is also the most commonly spoken language inside of the home. Second to French is the Tahitian language; a vast majority of French Polynesians also speak the indigenous language, even on islands other than Tahiti. When traveling to French Polynesia, a basic French vocabulary will probably get you farther than attempting to polish up on your Tahitian. However, learning a few Tahitian phrases to throw in every now and then not only shows locals your respect for their culture, but also helps to alleviate the ethnocentric American stereotype. A few words to pack along in your suitcase -- hello : ia orana, goodbye : parahi, good : maitai (yes like the drink), thank you : maruru, ans welcome : maeva.
Understand French Polynesian culture. The best way to communicate when learning a new language and traveling to a foreign country is to learn about the culture of the people you are trying to communicate with. While French and Tahitian are the predominant languages you will hear on a trip to French Polynesia, it is possible that you might come across one of the many other indigenous languages of the islands. There are yet many Polynesians of the older generation who speak Chinese Hakka, and yet others who speak the tribal languages individual to each island, including Austral and Rapa on the Austral Islands, Mangareva on Gambier and Mangareva Islands, Marquesan on the North and South Marquesan Islands, and Tuamotuan on the Island of Tuamotuan.
Studying any of these indigenous languages before traveling will be difficult. Instead, attempt basic French dialogue before traveling and keep in mind that what you will find will be a linguistic rainbow, so smile and enjoy the sound.