Well, nearly everyone seems focused on American junk food. I still say you can't beat the street food of Thailand & Mexico. But if you insist on some American junk food, make sure you try malasadas & shave ice with red bean paste when biking in Hawaii. And if you are biking in Quebec or some neighboring areas, you must try Canada's contribution to junk food: Poutine, a nasty concoction of french fries & fresh cheese curds, all smothered in gravy. One order of poutine kept me biking for a couple of days!