In 2009, when South Carolina Governor Mark Sanford (R) claimed to have been "hiking the Appalachian Trail" while actually engaging in an extramarital dalliance with a woman in Buenos Aires, I fully expected the the phrase "hiking the Appalachian Trail" to become the hot euphemism for such activity.
"Yeah, Donnie was supposed to be at some conference in Dallas, but I happen to know he was really, um uh, hiking the Appalachian Trail in Yuma."