Our family has twenty-somethings: they love the Segway tour(minimum age is 16), Pleasure Island late at night after we are ready to collapse, any park with evening extra magic hours, sleeping in and going to a park later and staying until close, then going to Pleasure Island.
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I make a schedule for the week showing the park for the day, so there is no wasting of time discussing where we are going. It lists a general touring plan and shows a parade time or a show time, as the week goes on and we have hit our must-dos the plan is less structured. I make one ADR per day-lunch or dinner, that way our group can split up if we want, and be able to get back together easily. The kids will show up for meals because we are buying, if they choose to eat on their own it is on their own money.
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I believe planning is the key to a great WDW vacation, remembering to be flexible and to allow everyone to put a couple must-do things into the schedule when it is being planned.
Have fun. It is even more fun traveling with the kids now that they are older!!