Some roads are scenic and very interesting drives. Terre twists along the cliffs on the sea side before swooping down into the town of Deshaies. I have concluded the the extra money spent on the roads in Guadeloupe must have come from the Guard Rail Fund, as there aren't any. In four days of driving, I did not see any police, unless they were undercover as skinny cows. One thing is for sure - no one has ever received a speeding ticket on Guadeloupe.
Traffic is quite fast on the open roads.
I do not recommend renting a car at the airport. You will probably want to take a taxi to dinner, anyway, so you are not concerned about the strength of your Ti Punch. All of the major rental agencies have offices within walking distance in all of the resort areas on Gran Terre and in the city of Basse Terre. All businesses except for restaurants close for a long lunch hour in Guadeloupe, so try to pick up your car before noon. You will thank me for this advice on the day that you leave.