I wouldn't take that amount of cash to Disney, you can do mobile order from your phone for a lot of the food places using the Disney app and you need a debit/credit card, it will save you time and you don't have wait in line to order food. In Disneyland you can have special characters greetings showing your Disney Chase card. If you have no balance on that card, I would use it for the trip expenses and paid it off at the end of the trip.