OP, I am with you 100% on what you eat on vacation is completely different from what you serve at home. At home my DD9 has oatmeal (5 min, not instant) or Cream of Wheat, or dry cereal and some fruit. At WDW many times her breakfast consists of poptarts, or even more recently bagels. The same goes for my DM and myself-when we are at WDW on the
DDP we have dessert with every lunch and dinner. At home, rarely out and only sometimes at home. Hey, what else is a vacation for if not to do things differently? Oh, and personally, I don't see much of a difference between a cupcake and say a danish or pastry for breakfast. And what about those mocha, frappaccino, iced coffees, etc. that so many drink everyday without thinking about the calories and fat grams? I am constantly amazed at how many young teenages in our area go to Starbucks for their daily fix.
You go mom

Hope they bring back the cupcakes before your trip. If not, you'll have to start a new tradition. Personally I think even ice cream is fine for breakfast while on vacation. At least it's diary!