We do Seascape every year. They are on the west end of the island, but it's very worth it because they are ON the beach. They have great bunks built into the hall for older kids, multiple bedrooms, a pool and you can take your own tent/cabana and set it up on the beach and leave it there for the duration of your stay. It's easy to duck down to hunt for crabs at night without having to cross the main drag.
Re: Galveston Vacation