Meet the Hot Tub Boat: a boat that is also a hot tub, allowing you to have a more relaxing experience cruising over the water. It has space for up to 6 people. The boat can be controlled with a joystick. The Hot Tub Boat has a diesel fired boiler to maintain your desired temperature for as long as you are out.
The above video shows what Hot Tub Boats have to offer. More information is available here.