AP Stylebook

Jet Ski is capitalized because it is a trademark.
Our primary dictionary, Merriam-Webster, defines it as a small motorized, usually recreational, watercraft.

Going upstate for a summer vacation?
Both the AP Stylebook and our primary dictionary, Merriam-Webster, show upstate lowercase and one word, with no hyphen.
Merriam-Webster adds that's the case even if upstate is used as an adverb or adjective, such as in "upstate cottage."

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