We will be on Raiatea on a Tuesday in March 2014 for one day. Our ship is docked there from 8am to 5pm. We plan to rent a car to go on the circle drive around the island. Since we need to get the car back by 4pm in time for the "all aboard," how much time is "safe" to allow for this trip circling the island? My wife is French so we should not have any communication problems for directions. Must "sees" on this circle drive? Thanks.