Renting a boat seems like a fun thing to do.  Having a hot tub is something people like a lot too.  I had never contemplated the idea of renting a hot tub boat, though.  Apparently this is a thing in Seattle.  We passed these people in their hot tub.  It sat very low to the water and I assume that waves lapping over the side is not going to result in them sinking but it still seemed like a very odd idea.  They seemed to be having fun, though.