There are some hourly public buses that run from Malmok to Oranjestad and it takes you 10-15mins drive. Even
car rentals are available, so you can choose either public transportation or renting a car. As far as I know Thrifty is one of the popular car rentals in Aruba, so if you want to rent a car, then call them on 888-682 9387 or 011-297-583-6000 and make arrangements. hope this helps!