We have never stayed at the Victorian we always stay at Silverleaf Seaside.
You might want to check out Moody Gardens here is a link to the site:
http://www.moodygardens.com/tickets/
They have a Festival of Lights set up for Christmas time thru New Year's. It could even take up to 2 days if you want to do all the things they have there. They have one day and two day passes and also individual tickets. Moody Gardens also has a Golf Course.
You can take the Ferry Boat ride over to the other side and back for free. We have done this several times and have seen dolphins in the water. It's a nice ride and if you take your car with you, you can drive around on the other side. Here is the link:
http://www.crystalbeach.com/greer.htm
There is Pleasure Pier if you like amusement rides. Here is the link:
http://www.pleasurepier.com/
Look for discount tickets.
You might want to check out Galveston Visitor Center online.