It's been said a million times, but VEGAN DONUTS!!!
They're so so so so good. I only have Voodoo Doughnuts in Portland, OR to compare with, but I have to say I liked Ronald's a lot more. These are the traditional type donuts. Very inexpensive, very tasty, very fresh.
We ended up getting a dozen assorted ($7.35) and a dozen donut holes ($1.00) for our wedding celebration!! Of course we had a few fancy donuts and coffee while we were there.
Definitely worth the monorail -- bus ride (#213 from convention center) -- walk -- bus ride -- monorail. (Cheaper, and more fun than a cab!)