yes you can request a box for dessert (not allowed at buffets, though)...but order your dessert carefully! Many, many of the desserts are very perishable and/or dairy and will not keep for long, or travel well if you're going back to the parks (think desserts like cheesecakes, creme brulees, mousse that are so prevalent at the restaurants.) Many desserts that would travel well are usually served with ice cream (like a pie ala mode, or blueberry crumble with vanilla bean ice cream) so if you order one of those, make sure to tell them no ice cream or whipped topping. Do remember that most places may have a fresh fruit option that would be allowed for dessert if you're not much for sweets...can't hurt to ask.