Put actors into Ghillie Suits. People will here footsteps, see bushes rattle, catch traces of movement and shadow, but will never see anything. This is always a great way to build tension in an outdoor haunt.
Consider putting in a visual werewolf transformation. Very high on the "cool" factor. Be sure to put in lots of paw prints, etc. Create a very strong back-story. Why are people walking through a forest full of werewolves? Do they know they are walking into werewolf country?
I, personally, love werewolves. I have used them before and will again in the future.
Lords of Chaos, LLC
House of Chaos Haunted Attraction