The only public transportation in Bora Bora is Le Truck , really just a bus that goes halfway around the island and back every hour or so. Most hotels will arrange for transportation if you make arrangements in advance. Even so, bicycles and mopeds (with mandatory helmets) are probably your best bet.

When taking the public bus make sure you know the fare as you might be overcharged, as not all drivers seem to be above ripping off tourists!