Cruise lines will keep spending billions of dollars on ocean-going monstrosities that promise to be the most relaxing way to spend your vacation. But they can't hold a candle to this tiny seaworthy hot tub that's warmed with a simple wood burning stove and propelled with a quiet electric motor.
The HotTug will easily ferry six to eight passengers whether or not the glass fiber-reinforced polyester hull is filled with water. It works as both a floating hot tub or a regular boat, but presumably gets far better mileage when drained. A wood stove safely heats the water to whatever temperature you desire, and you can add a gas outboard motor if the built-in electric option doesn't have enough range or speed for your liking. The boat itself, stripped of motors and the stove, will set you back around $11,600. But fully equipped you're looking at spending upwards of $21,300 for what has to be the most relaxing way to enjoy the water.