DON'T RENT A CAR ! !
I've been living here for 5 years. I think that Canadian Bob is rendering sound advice. Other suggestions: don't drive unless you have to; better to rent a car & driver every other or every 3rd day. Rent from a reputable [ie American] company & use a USA credit card. The credit card bank will usually pay the deductible, but check 1st. If there's a problem, you'll have some leverage with your bank. Never, ever, ever drive at night. It' simply suicidal; 1/2 the Dominicans drive with the high beams on all the time at night; the other 1/2 drive with no lights on at night. 1/2 of the Dominicans driving cars have no operator's license; 90% of the Dominicans driving motor cycles have no license. If you enjoy a drink or 2, you might then drive; operating under the influence of alcohol is not a crime in La Republica. People frequently walk in large or small on the edges of the road at night, even late at night.. Many motocycles & scooters have no lights that work & are invisible at night. Farm animals running wild are an occasional problem. Some Dominicans drive on the left hand side of the road, day or night, if it's more convenient! If there's a serious accident, a foreigner will nearly always be arrested, regardless of circumstances, negligence, or fault. Much better to hire a car & driver at night. Driving here is like a giant game of 'bumper cars'; if you know what they are. Enjoy.