This wasn’t a guided boat tour, and it wasn’t more expensive than if we’d been staying in a hotel and going to French museums instead, but back in 2003, we rented a boat and cruised in the Canal du Midi, in Provence. The company actually rented out British narrowboats, designed for canals in the U.K., and ours worked OK in France. It had a galley (kitchen), shower, dining area, beds, and the 3 of us were comfortable as we navigated up and down some of the canal. There was a strike when we were there, but we never made it to any canal locks that would’ve needed to be operated. Looking up the boat rental company just now, I see they’re permanently closed. They were operating a couple years ago, so that’s too bad. There may still be other options, if you wanted to captain your own barge, and it might not cost a captain’s ransom.