I have two boys, 16 & 12. They are eager to spend the week at Disney. The parks interest them, they're even going to ride IASW with their mom. We did make a point of placing some teenager stuff in the plan too. We got the park hopper plus tickets ( a cheap add on in my view), so we will be hitting both water parks and Disney Quest during the stay.
The other thing we are doing is giving ech of them a day to plan. They pick the park, the itinerary, the meals, everything. I was pretty amazed at their first passes....well thought out, and I'm going to have fun too !!!
Good luck. Make them a part of the planning and they'll enjoy it much more !!