It really depends on how many of you there are. There were 4 of us. We rented a car from Thrifty - they picked us up at the airport, and took us to their lot. We returned the car the next day to the Miami airport, and they in turn took us down to the port. The rental for a full size for the day, with taxes, etc, was $32.00 total. When we returned, we wanted to just go straight to the FL airport, so we took a cab. The total fair was $58 + tip. The car for the return would have been $45.00. Our friends (party of a 4) took the Carnival bus back to the airport and paid $15 each. Hope this helps...