Do you mean, "Where do I post / ask about HI?" or do you mean "I checked the "Other Cities" discussion board and there isn't a lot of activity about HI, only one or two posts per month, so I think there should be a dedicated board for HI." ?
There are too many dead forums already so I don't see a HI board happening any time soon.
Edit: There IS a "Hawaiian Islands" Ad Board.
-- Modified on 8/7/2016 11:20:29 PM
There is a Hawaiian Islands as board which was added a few months ago. For discussion use the "other cities" board.
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