Even Hawaii has a gradient of pricing. General cost of living is more expensive than most places on the mainland because almost everything has to be brought in on a ship, but outside of the major tourist cities prices are more manageable.
Housing is slightly cheaper, but food and utilities are substantially more. All-in -- especially if you're renting -- HI is more expensive than SF proper.
ie, one of the only places more expensive than the bay area. Not sure what point this proves...