Watch for the red "Hot Now" sign out front to light up, because that's when the doughnuts are coming out of the cooker. Krispy Kremes are best hot (well, aren't all doughnuts?), but if they cool off before you get them home you can use the microwave to reheat them. Krispy Kreme sells a large variety of doughnuts, but the most popular is still the original glazed doughnut.
Aside from eating, the best part of going to Krispy Kreme is the big window where your kids can watch the doughnuts as they rise and cook.