I think that the biggest “underground” money maker is pakalolo (weed).
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It used to be, common knowledge that the Hawaiian mafia, protected by politicians, had huge grows on the Big Island, and many smaller growers of course. I don’t know how big it is still, considering it is now legal in WA, CA and OR. Of course the legality here is wrecking people but who cares.
That Maui Wowie never makes it to the East Coast.
And AK.
I'm looking out my office window at three people passing a joint across the street right now. (Smoking in public is still illegal, but I'm on the waterfront so...)