Well as a mom with 3 teen boys I would say for restraunts:
1. ESPN, this is for sports nuts, by the boardwalk
2. Coral Reef (Epcot)- what could be more cooler than being surrounded by fish?
3. For BUffets, they prefer the dinner since its our one big meal of the day, They gladly put up with the characters to get the unlimited food, They like Crystal Palace in the Magic Kingdom and Chef Mickeys at the Contemporary.
My boys also like to spend alot of time at Disney Quest, but if you dont have a ticket that covers that option you could check out the arcade at the contemporary, its huge and my ds also like the arcade in the magic kingdom in tommorrowland, I think its by space mountain. They also like the dinoland games at the Animal Kingdom.
They have also done the horseback riding at fort wilderness, which they prononced lame, not holding their interest, They have done both the kids and family fishing trips and have done the parasailing at sammy duvals at the contemporary. Those are fun but expensive options. They have done the mouseboats too.
They love the water parks too. Overall they prefer blizzard beach but they like the wave pool at typhoon lagoon much better, that coming from my oldest ds, 17 who is a lifeguard.