Maybe the Takai City Hotel has one? I've never been to their RP area (you pay for the room and get access to hotel amenities), but they do have various RP shops and cafes scattered around the city. http://maps.secondlife.com/secondlife/Kiyori City/143/90/23
Seaside Restaurant and Sushi Bar: http://maps.secondlife.com/secondlife/Ghambt/19/242/25
There's a tiny sushi restaurant at the Village of Ahiru: http://maps.secondlife.com/secondlife/Ahiru/206/107/22
They're all Japanese/Hawaiian themed, obvs. I found them while bouncing around the grid. Have fun!
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Forgot to add that the SL Hotel Inspector website is a great resource if you're looking for vacation/hotel/restaurant RP. There are all kinds of mostly paid, themed sims to visit, and you can get a preview of what they offer from the reviews on the site. https://virtualhotels.online/start-here