A group of 6 of us will travel from San Antonio to Galveston in July for our first cruise. We need to rent a car to accomodate us all (and our luggage). We obviously will rent a van. But I hate to rent a car, leave it in the parking lot and pay for rental and parking while onboard fro 7 days. I see the cruise offers transports from the airport, but you have to provide flight information. We are driving, not flying. Any suggestions for one way rentals? Are there rental agencies near the port?