I wouldn't worry about it. The parks close early in September, and Mythos may not be open for dinner. The best advice is to go there at 11:30am when they open, and eat lunch. Bring the leftovers back to your room, and snack on them.
If you're going to stay in the parks, then share a meal and save room for the desert shots. You get the free bread to start, and most sammiches come with plantains. If you share a wrap of the day or cowboy burger, and have desert, you won't fall asleep when you walk out of there.