To add even more haunted environment plan on doing something with the que line area. One of the coolest ways to make your que's area themed are with digitally animated talking animations. Consider several skeletons telling jokes to one another or a band playing scary songs. You could even hire an illusionist to add some flare to the que area. Our favorite thing to add to the que line area is a haunted museum.
Several people sell full sized movie monsters or they can be made after purchasing collector masks.
One thing we've done in the past was to add 'scare-oke' which has the customers entertaining themselves. Any of these items should be considered to be additional haunted attractions whether or not they're a maze. Now you're up to like 8 haunted attractions. You're now a scream park offering more than the typical haunted houses and you're ticket sales will reflect it. So when you plan your next scream park remember that you should try to put most of your budget toward two top notch attractions and a smaller budget for something more simple but still effective.