No, you don't need an international drivers license. My New York State license worked just fine in Tahiti and Bora Bora. By the way, stay away from EuroCar in Bora Bora (they were fine in Tahiti). They were a skanky bunch trying to pass of defective cars and not offering refunds when you brought them back. Ask around on the pier, there is another agency on the island (ask the agent with the walkie talkie) and they will deliver the car.