Milkshakes aren't just for kids. At Milkbox Creamery, you can choose from four pre-determined boozy options, use a list of available spirits to make your own, or grill the counter staffers for their favorite liquor-fueled creations. How about Key lime pie and coconut ice cream with rum? Or maybe s'mores ice cream spiked with bourbon? No matter what you decide, each $10 treat is made with goods from Little Man Ice Cream and comes in a giant glass complete with whipped cream if you so desire. And because of Milkbox's location, you can enjoy your adult libation in the very grown-up lobby of Union Station.