R.D.
Poor guy! I was 5 the first time I broke something... I understand ;)
Does he have to keep it elevated? Or just stay off it? Get a bean bag chair, and prop him up in whatever room you're in. Get a tv tray so he can play with legos, playdough, puzzles, color, etc. Let him cheat his heart out at card games! Have him make up some of his own, then teach you the rules. Bet with pennies ;) My grandmother used to bet us pennies... she robbed me blind every time, even when I DID cheat!
Get a video game system. I know, you said not too much tv, I can't say I blame you... but it will help! You can't be there every second for the next 6 weeks ;) Or a game boy, whatever kids are playing these days. They have some really educational games out now.
ISPY BOOKS ROCK! They also have a DVD game :)
Can you rent a wheelchair for him? Get him out! Take him to the park or museum or even the store...
Good luck! It's going to be tougher on YOU than him, but you'll both make it :)