I'm writing about a river rafting trip, that turns into a nightmare.

Anybody know of any river rafting adventures, rivers, that seems like
it could end up being a horror ride?

River might have:
-beautiful scenes, then have abandoned buildings or towns next to the
shore at certain points
- the people running it might just be a little behind the times, or
backwards as far as blending into society?
- the people or who run the trip, might seems a little untrustworthy?

Looking for any Rivers, that would have rafting on it, but maybe in the
carolinas or appalachian mountains? Otherwise, ANYWHERE in the USA.

Any comments or resources or thoughts would be helpful.

Thanks.
GC