My son is 6 and has Autism. We will be going in ablout two weeks. Our plan is to do the same things that we do while not on vacation. My son also eats with his hands and takes a really long time to eat (he seems to like to check everything out instead of eating). So we will not change what we do there from here. We always orders foods that is fine to eat with your hands (i.e. Fries, Burgers, chicken strips). He also gets over stimulated, so we are ready for one parent to take him away while the other is with DD who is 10.
We also are planning to go to Daytona and stay on the beach for a day and an half in the middle of the trip to give him a break for it all.
I know that my kid is only 6 and with a teen it is completely different but I hope that our plans might find a way to help you think of some different things that you two can do. I’m sure the trip will be enjoyable and he will love it.