Agreed on the skills competition. Let the WR try all the catching challenges. Does anyone remember the Disney obstacle course/relay race that teams of atheletes would do against each other? Something like that with the Pro Bowl invites would be cool.
Farthest throw competition for QB's, Farthest throw for competition for non QB's, most accurace for QB's, kicking challenges for punter/kickers and kicking challenges for non punter/kickers. A flag football game maybe? Just make it a bunch of wacky, fun stuff. Its the end of the season so nobody is going to go all out in a meaningless game. Oh and of course you have to do 40 yd dash race between players too.