Need ideas for a haunted trail?

For characters on the trail so far we have Leatherface, Michael Myers, Freddy Kruger and Jason Voorhees. We have the full costumes for every character and they will be at different parts of the trail. We have a custom Jigsaw (SAW) video that we made that will play right before the trail begins and we also have my wife who will be dressed like the the girl from The Grudge crawling after the kids in a strobe light tunnel. What we need is ideas on how to incorporate all the characters. There is a bunch of other scary stuff on the trail like a biker slashed in half and a guy buried alive in a gl coffin but the characters I listed above are our main scares so we need kind of a way to introduce them out on the trail rather than them just jumping out of the bushes and scaring the kids. All the kids have seen the movies so I we want to stay true to the characters, that seems to make it more scary. We got an awesome staff working on it so shoot me your greatest ideas......THANKS!!!!!!