How to disable Airplay on IPad?
No it is not possible to disable AirPlay. However you could add a volume limit with Restrictions. Also with iOS 6 you can have more control over how kids control the iPad with Guided Access. You can limit the iPad to just the current app and lock off parts of the screen.
Or.., buy a router with a seperate guest network and have the kids toy access the Internet via this. Only solution for the ipod .