Depends what your looking for and in which park.
In the
Magic Kingdom, I would head over to the Aloha Isle in Adventureland and get a Dole Whip

. In Liberty Square there is Sleepy Hollow, which has funnel cakes and Mickey Waffles.
Over in
Epcot they have a crepe stand in France

, I would walk around the World Showcase to see what appeals to you.
In
MGM/DHS we always try to go to Dinosaur Gerties for an ice cream
Animal Kingdom has Harambe Market that has good fruit choices.
