In Hyperion, the character Martin Silenus is rich enough that he lives in a novelty palace where all the rooms are connected by teleporters. As a joke, the bathroom is a wallless raft on an ocean world.

Outside of the realm of science fiction, my sister followed a TV show for a while that was basically a set of advertisements for a modular home company. One episode featured the installation of a small home on a remote British island; the shower was a pipe outside the house itself.

We installed an outdoor shower at our house. There's nothing as nice as a cold shower outdoors on a really hot day. It feels so luxurious that I can pretend I'm a rich person instead of lower- to mid-middle class.

We live way out in the boonies, so that helps.

I wasn't expecting to read a Hyperion reference in this thread, such a great book.

(And if you haven't read the book you can guess what could possibly go wrong with this setup.)