Family-owned Mr. Donuts & Bakery in Honolulu is a true hidden gem in the Hawaiian capital. It's only been open for the a few years, but it seems to have found the perfect formula for success: cheap and huge donuts + fast and friendly service + fresh-baked deliciousness. Like most of the other spots on this list, you have to go early before all the crowd favorites run out. Highlights include the blueberry glaze, baked old-fashioned and glazed yeast donuts.