In addition to Marci's comments, if you can, I highly recommend that you pre-register for the DAS before arriving at the park (this link has all the details: https://disneyworld.disney.go.com/en...vice/register/)

Once registered, it will allow you to pre-select 2 DAS attractions each day, you have to use them within the return times given, but they can help ensure you get to do some of your "must-do" attractions.

I just remembered that this is likely a surprise trip, but you can still pre-register, you will just need the child to come to the computer to get their photo taken, they don't have to be right with you when chatting with the Disney cast member.