Just have a look at the number of "play" tugs, some really elaborate, not something imporvised, posted by kids on youtube.
A good starting point is
www.youtube.com/user/Ryanorange2 and you'll see what I mean.
BTW, the games with handcuffs and thumbcuffs were done openly in the church camp even in the parent's day and no one complained. They just took it as it should be. An innocent game.
I noticed that a couple of dads were takning pictures aplenty...

Funny I haven't seen them on the web up to now.
Laro