Thank you. You convinced me to play it safe. I will return the car at Marigot Bay the night before and will make arrangements with the hotel for the transportation. I have extensive driving experience in several countries in all sorts of conditions (day and night) but in this case there were too many risk factors. I would have done it daylight, but given the early hour, it's better to play it safe. I appreciate your advice.
Good. The idea of navigating that road in the predawn hours doesn't appeal to me. Leave it to a local who knows the lay of the land.