Hey, Mary from Alabama the beautiful! I'm thrilled that you're leaving for WDW in just a few days, but I don't want you to worry. There is certainly a lot to do, but it's a great "problem" to have!
I just answered another question for a guest who was trying to plan an itinerary at the last minute, and I think you might find the information about Advanced Dining Reservations as well as calendars for the parks helpful to you, too. You can access that answer
here.
Without knowing particulars about you and your traveling party, I would recommend visiting DHS on July 4th to watch its fireworks show and the later showing of Fantasmic! -- just to make sure you get your #1 "must do" done! Then, the Magic Kingdom is open until 1 a.m. that night -- if you don't mind the crowds.
For the rest of the week, schedule your park times around the ADRs you can make and late Extra Magic Hours offered. In the summer, we love sleeping in, hanging out by the pool in the afternoons and hitting the parks when the sun goes down.
If you have any more questions, I'd love to help you out before you leave! Have a wonderful Alabama day and a magical vacation!