Galveston Taxi, Galveston Shuttle, Limousine, Town Car Airport, Limo, Port of Galveston, Texas
It may be less expensive to do RCI's transportation. Are you sure it was $200 one way and not round trip? They normally have a package you can purchase for hotel and transfers. Sometimes it works out to be less expensive, sometimes not. Galveston is a good way from Houston. This might help you find a hotel: HotelGuides.com - Real deals. Real service. Real easy.
Everyone that I know has driven to Galveston, so I'm just using search tools to help. Maybe someone on our board has specific information.
I do hope you and your family have marvelous weather and a fantastic cruise!