I went to a haunt this past October which is basically the same theme.
http://www.hauntedhousenyc.com/
It was called Nightmare, but this year it's called Nightmare: Ghost Stories apparently.
Find my review for it in my posts if you want to.
Anyways it sounds similar to yours.
My favorite thing to use in my haunts is disorientation.
It's so creepy to walk aroud in pitch black with no sounds or anything and then you start to hear some breathing or something.
OR, an idea I had for my haunt this year is to have a room with a door on the other side or whatever, and just have it look normal, then turn off the lights and have the room be spinnable, cheap wood. Have a man to each wall on the outside spin it clockwise when it's pitch black and then turn the lights back on.
OR strobe lights while it's spinning.
I think that would be reeeeeally confusing.
