Hi Tracy!
I am very happy to offer some different things to do on your Walt Disney World Vacation!
There are lots of various
Walt Disney World Tours and Experiences that are offered. I, personally, would recommend the
Dolphins in Depth Experience. It offers a very unique opportunity to learn about dolphins and concludes with some time in the water with the dolphins and interacting with them. There are quite a few tours and experiences that your 15 year old would enjoy.
I would also recommend the
Characters in Flight experience at Downtown Disney. You will get approximately a 10 minute flight upon a tethered hot air balloon at 400 feet above Downtown Disney. It provides you with many beautiful views of the WDW Resort.
Another nice break from the theme parks is a visit to one of Disney's two water parks:
Disney's Blizzard Beach Water Park and
Disney's Typhoon Lagoon Water Park. It will feel great to get away to either one of these water parks during the month of August when you are visiting.
I would recommend the following restaurants: 'Ohana at Disney's Polynesian Resort, Sci-Fi Dine-In at Disney's Hollywood Studios, 50's Prime Time Cafe at Disney's Hollywood Studios, the Rainforest Cafe (at both Disney's Animal Kingdom and Downtown Disney.)
I hope this helps give you some ideas of different things to experience on your Walt Disney World Vacation!
Have a magical trip!
Scott