For a cheaper, more relaxed option, you can try floating houseboat condos

If paying $40 million or even $3.7 million for floating investment properties is a little out of your acceptable range, don’t give up. You still have options. Houseboat condos are another new set of investment properties that can be quite lucrative for their owners.
Not only do these floating investment properties have the same appliances and features of a regular home, but they cost much less as an initial investment. Additionally, they still feature parking for boats and other gear and they’re much easier to get to and leave than an ocean liner.