Book or series with a boy called Kai and a girl name Avery, on a cruise ship, maybe a Hawaiian background > Likes and Comments

I need help finding the name and author of a book... I think it was a series of books actually (I know there was definitely more than one)
It wasn't spicy or smutty (may have been Christian)
The female character was Avery (I think)
The male character was Hawaain and his name was Kai.
I believe they were on a cruise ship or something like that.
I read this book as a teen (I'm now 30 so it's been a while) and never managed to read the next so I'm trying to find it to read again...
It's not Love on Deck

Does anything on the Cruise Ship YA list look familiar?

Ready! Set! Hawaii! by Annie Bryant?