Driving is on the right side of the road. It's allowed to drive and rent a car with a valid international drivers license, for longer periods (3 months) it's required to exchange it to a Curacao Drivers License. It won't give a problem if you don't, Curacao police it very flexible, even drinking is allowed as long as you don't crash your car. As long as you stay friendly to the officers. Most car rental companies add an extra fee for drivers younger then 25.