Actually, the itinerary they give you is based on information that you give them. After you have a confirmed reservation with DU, they'll send you a link to a questionnaire. They ask you for specific information about dining (whether your family relies on sit-down, counter service or just winging it), your park strategy (commando, slow pace), etc. You're also able to fill in your own comments, if you want to set aside a day for a water park or mini-golf or whatever. DU uses all this information to help plan out a workable itinerary. They'll also incorporate any priority seating arrangements into the plan. They make note of the hours, early entry days, parades and fireworks. It's definitely great to have as just a reference point.
Tammi