Even if the ocean is inconveniently distant when building your onsen there are other options for a nice bathing environment.
Why do we put the clean and the dirty in the same space?
Coolite Bamboo on Hastings Street in Vancouver sells blinds and screens, cut to measure.
We'd still like something to hid the tank. Perhaps a framed painting that could come down off the wall when needed.
The screen rolls up and fits nicely into the bathroom cupboard after a relaxing soak.