One of the sections of Cloud Atlas is set in a post-apocalyptic Hawaii. The whole book is good, and that section is great.
Just found this on Amazon: The Islands at the End of the World
https://www.amazon.com/Islands-End-World/dp/038574403X
I know of another one, a single book in a series that's set in Hawaii, but I can't remember it right now.
Also on Amazon: The Sea Peoples (A Novel of the Change Book 14)
https://www.amazon.com/Sea-Peoples-Novel-Change-Book-ebook/dp/B01MY93675
You might like this too: https://www.youtube.com/watch?v=Wcos-5agj_0
And there's a new game set in a post-apocalyptic Oahu: