We rented a car from Avis. It was $37. Driving to the Port was easy. We dropped our luggage off at the ship, then drove about 1/2 mile to the Avis place. Returned the car and their shuttle took us straight to the ship. We arrived the night before and wanted to be able to eat out and get some bottled water. We stayed in a Days Inn near the airport for $30 something. There were no restaurants nearby except an IHOP so we were really glad we had the car.
Coming back from the cruise we just took the Mears shuttle. But it ended up costing more than the car did.