Slick Rocks at Priest Lake...
15 miles on a rough trail, two mile hike up to the rocks... Everything was unmarked to keep the touristas out... There was a bear just around this corner...
So, the slick rocks were at about a 40 degree angle, water running down the face, 100 feet long and you were supposed to wrap your biscuits in a garbage bag to aid in making the run. There's a rope at the end you're supposed to grab onto to avoid a nasty rock called "razor rock". No one even came close to the rope, though.
The lady at the bottom volunteered to help stop anyone who might come close to the rope, but mostly she just took pictures of everyone. 16 people made the trek to the secret locale...
This was a little further upstream...