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Chinese activist who mocked Xi Jinping flees to South Korea on jet ski, arrested
(www.indiatoday.in)
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I don't really know but...
Looking at it on a map it looks like it's a huge bay, enclosed on 3 sides. I doubt there would be any significant "swell". There might be small waves whipped up on a windy day but barely enough to trouble you on a jet ski particularly if you're moving.
The main risk would be exposure. Too hot, too cold or too much sun even on a cold day can really fuck you up.