There are rental companies that base out of the airport near Grand Case. We rented from one a few days in our stay they dropped off at our hotel and when they picked it up they took us to the airport on the Dutch side. So cab to Orient, rent a car in a few days, get a ride to the airport. Pretty easy. Most hotels and condo rentals have car rental info in the lobby. We tried to go strictly cab one trip and it didn’t work out to well. Who knew cabs don’t run when it is raining. That’s what we were told. We had to give a bartender 25.00 to take us back to GC from OB.