Arriving in Charleston Sat, 4/28 and leaving for Savannah Tues afternoon. I know we don't need a car in Charleston but trying to sort out how to get from Airport into Charleston and then pick up a car Tues afternoon. Would it be better just to rent it on Sat and pay for the parking, etc until Tues? There will be 4 adults and we are staying at Elliot House. Thanks for any thoughts.