Another thing about movies being used in a movie theme park like Universal is atmosphere music. You listen to JAWS, Backdraft, Back to the Future, E.T., Jurassic Park, Mummy, Waterworld, etc and you can recognize where it's from. So they should keep in mind of that. The recent Zorro films have a good music theme. I really liked Van Helsing's music, wish they just play the music from it in front of Universal's House of Horrors. Now with The Simpsons, many people know its theme song.
They should at least have t-shirts for Waterworld. It's a great stunt show, but because of its bad rep, Universal probably doesn't want to merchandise too much into it.