I have an idea. Why not make most of them young and attractive but with some nerdy, sensible friend to offset the 'jock' who will be part of the group. They could head off to some remote cabin up in the woods. One of the attractive blond females will be shown having a shower or swimming naked just before she is killed. There could also be some form of double bluff including the local sheriff who either seems weird but ends up the hero or who looks after them and is in league with the killer.
I think between us we could make a fortune with this idea!
