Hi, Teresa! You don't specify which tour, so I am going to make a guess and assume you are thinking of taking the Backstage Magic Tour. All of the tours I've been on at Walt Disney World have been fantastic, and I think the Backstage Magic Tour is one of the best.
You'll feel like a real "insider" once you've completed this seven hour long tour. You'll get to enjoy some of the things other guests don't know anything about. Everything from costuming, becoming a guide at Disney's Animal Kingdom Wild Africa Trek, and even a visit to the kingdom underneath the Magic Kingdom - the utilidors - is included in your full day of touring. You will get fascinating facts, interesting trivia, and really see how things are done from the other side of the fence. You can learn more about the tour by visiting
Backstage Magic.
Especially if your granddaughter is a huge fan of all things Disney, this would make a great part of her graduation trip. And since she's been going with you every year, this would be something so unique and so interesting - a whole different perspective on Walt Disney World.
Have a wonderful time, and good luck for the rest of the school year to your granddaughter!