Will you really need a ton of snacks? Are you doing the
DDP? Which one? Are you going to want to try all the yummy snacks in the parks? Do you plan to carry a big bag into the parks?
It really is not that hard to pack some snacks in your luggage (checked). We pack snack breakfast foods but that is about it. They pack well in the little spaces between clothes. We pack cereal bars, juice boxes( in baggies just in case), mini boxes of cereal, pop tarts etc. You would not want to buy typical snack foods such as these in the food court as the cost is soooo high when it is easy to bring them along.