I expect this will not necessarily work in the minds of some people, but yestedray Mark Oaten asked a question about something that seems nonsensical to me and exactly the opposite of what you want to do. He asked the Ministry of Justice "how many prisons in England and Wales participate in child-friendly visit schemes."
Now surely the last thing you want for an impressionable young mind is to make a visit to a prison be "friendly"? If someone takes a child along to see Daddy (or Mummy) do you really want them coming away thinking "well that was a nice place"? Surely you want them to come away thinking "I never want to go there"? So actually, they should be pretty "child-unfriendly" really?