Lots of beach houses have an outdoor shower. Many are just a cold water spray, but friends owned one where it was a cubicle with actual hot water available. That was pretty nice.
Something that’s not necessarily weird, but definitely a design decision I would not vote for: when we bought our first place, in NC, there was an attached shed off the back deck. The washer/dryer could be either inside, or in that shed - meaning you’d have to run outside to deal with your laundry. Not so bad on a spring day, bad in the rain or snow.
Ours had it inside. A neighbor chose to put hers in the shed because she had 2 kids and needed all three bedrooms, and needed the inside closet space.
There was one time where we’d done some really grimy outside work, and came inside, and dumped our things directly into the washer and went upstairs in our birthday suits. I would not have wanted to do that if the machines were off the back deck!!