I first discovered ColdStone Creamery when I lived in Chicago, and it is, without a doubt, THE BEST ICE CREAM IN THE WORLD. If you ever go, (there are like 3 or 4 locations in Manattan) the cake batter ice cream in the Birthday Cake Remix is insane.
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My favorite is the Peanut Butter Perfection. Whatever you do don't tip them though. The whole staff will break out into song and practically drive you out of the store.