"...how vacation rentals affect Hawaii’s tax revenue, housing supply and brand as a visitor destination?"

ONLY POSITIVE IN EVERY WAY ! MANY PEOPLE HATE HOTELS, SO MORE WOULD COME ,THEY SPEND MONEY AT EVERY TURN AND TAX REVENUE GOES UP.  HOUSING SUPPLY IS PRIVATE BUSINESS. IF YOU HAVE NO PLACE TO LIVE MOVE TO WHERE IT IS CHEAP ON THE MAINLAND !