You will need to cab from the airport, no big deal. Getting a cab to go around the island is best set up ahead of time. We tried to stay in GC with no car 5 years ago and got stranded at Orient one day. We were able to rent a car on the French side and it was a good experience. They dropped off a car and took us to the airport after drop off. We have also rented in Orient and rented a car for a day or two to explore. If you have no ambition to explore the island I can see a stay at the GCBC with days by the pool and beach and dinners in GC. Check to see if they still do the catamaran trip out of the resort, fun.