Since I have three boys, I am always looking for boy stuff to do. Here are some of my suggestions. Your boys are a little older than mine but I think they will still work.
If they like fishing, you can book a fishing boat. Maybe DisneyQuest, my boys like all the games. They have parasailing at CR-looks fun but I have never done it. My boys also love US/IOA(the rides there are perfect for pre-teen boys)-tickets for US can be less than BBB. Mini-golfing, water parks, rent a canoe. Pick something they have an interest in, you will probably be able to find it at WDW. But if you can't there are so many things nearby like the gator farms or airboat rides in the swamps, etc.