That reminds me of when we were in the U.K. a few years ago, staying in Cropredy, just north of Banbury. The Oxford Canal runs through town, which is still used for pleasure boating. But I was surprised. I had known about canals in England but the thought of actually seeing one never entered my mind. Locally, in Maryland, there is the old C&O Canal, still useable in places with working locks, but the canal path goes all the way from D.C. to Cumberland, Maryland, a distance of 184 miles. That would be an interesting challenge for a long distance hike, that is, if you cared to visit Cumberland. There are a couple of places off the path not far from Washington where a little outdoor nudity is possible or used to be. Parking is chancy, though.