Last year, while deep in Quetico, we hadn't seen a canoe in three or four days.  We decided to establish a two/three day camp and enjoy some fishing in relative isolation from the rest of the world.  I set up the camp, and my husband set up the extras, such as the Solar Shower.   For the latter, he found a tree on a point right out into the lake.  Lovely view for our evening ablutions.  The next evening, after a very warm day of fishing and paddling, I decided to avail myself of a hot shower.  No sooner was I standing, in all my sixty year old glory, which means (as my son put it, you can't tell the stretch marks from the cellulite) a crew of young American Boy Scouts hove into sight.  What could I do but cheerfully wave as I tried to wrap a towel around my sagging body.
I wasn't impressed, and neither were they, as they obviousl paddled away from our shore.  I no longer assume that even the most isolated lakes are "private" and I now select the site for our shower stall!!