WDW Planning
Two of my boys were ages 4 and 5 when we went in '94. I found it helpful to write down the rides I wanted to see at each Park in some kind of "geographic" order on a little Index card. (The Passporter -
www.passporter.com-- includes great maps of the parks that would help here.) But I also knew which things were "must see's" for us, like Peter Pan, Haunted Mansion, Pirates of the Caribbean etc.
I found that we could get through the days well if we were good about early bedtimes. Nowadays, as they're older, we take pool breaks during the days and stay out later.
However, everyone is very right in saying that one key to making it a really enjoyable time is to listen to your mom's intuition about what the kids/family can handle. You know what pace you can endure for how long.
Your energy level on day four will not be equal to day one. You have to know when the adrenaline will be pumping, and when you might hit 'a wall'. I've found that the day after an E-night almost always must be low key.
My mom planned an "active" vs "not-so-active" schedule. The second schedule included a later wake-up, maybe a nap or swim break, and a longer, sit down dinner, maybe a show. That way, depending on how we felt, we could tackle something either ambitious or more realistic.
Hope that helps! Have a great time!! I'm so jealous!
Lori