PolitiFact rated Gingrich's claim that food stamps can send people to Hawaii as "Pants on Fire," it was so wrong. Food stamps can only be used for food.
Yes, that's true, but that doesn't mean getting food stamps can't result in you being able to afford going to Hawaii. (I doubt that's what Gingrich meant, but it is true nonetheless). Food stamps are basically gift certificates. If I give you a $1,000 gift certificate to Wal-Mart, it will assuredly result in you buying more goods that don't come from Wal-Mart. You will substitute money you would spend at America's biggest retailer and instead spend it on other things. If you get food stamps, the effect is the same. So yes, food stamps can send you to Hawaii, though not directly.