Every once in a while, we run across a product that's more or less self-explanatory. Such is the case with the Hot Tub Boat ($TBA). Capable of holding six people on the water or eight at the dock, this buoyant soaking tub is powered by an electric motor that pushes you along at a leisurely pace of five-or-so knots, so as to not splash around the water inside — that's your job, after all. [Scouted by Brian]