1) back in the late 80', paddling down the New River, came a whole raft of people in various states of undress. Turn out to be the Virginia Tech Cave club on their annual river float.
2) 2012, about 3 days into the Boundary Waters Canoe Area, my Dad and I were finally getting to the point where we weren't seeing many people. I was pretty rank, and we completed a long portage. It was hot, and I was skanky. Stripped down to take a dip to get the funk off, waded about 25 feet into calf deep water, and around the bend comes a canoe with a lady in the front and a guy in the back. They veered off for a go-round. I did my dip and re-clothed, they came back to make the portage. They guy was cool about it - I mean, hell, you gotta bathe sometime right? But the chick looked seriously pissed. All I could think was, man what a brutal trip to have to make with that bitch. Poor dude.
3) This summer Swallow Falls, MD, came around a large rock to a very attractive young lady pulling her shorts up and fumbling with her phone to make like she was trying to take a picture. Big shit eating grin on the skinny kid with her. Luckily, my kids (3 & 4) were making enough noise that they heard and finished up (for the time being) or I would have been doing a lot of explaining to my 4 year old boy.