S.O.
My son was 10 when he broke his arm. A friend got him a pair of walkie-talkies. He had a blast! Even if he was playing with other kids who could run and jump around, the walkie talkies were cool b/c they can still all play "spy" games....etc....
Remember to give a pkg. of batteries with the walkie-talkies. Lots of times people don't have that type just laying around the house.