I've been searching for a car rental agency actually in Galveston so that we can rent instead if getting the transfers. I know others have been looking as well from the threads I've been reading.
Enterprise is in the process of setting something up so that cruisers will have a place to drop a car off on Sunday. The lady I talked to said it will probably be a dropbox for the keys and to call back in a month and it should be in place by then.
Just another option for those of us cruising out of Galveston. Especially those going in the day before. It will give little more freedom. Hope this helps someone else.