>I bet some of you have organized or attended a Middle Ages-
>related scout camp. I'm planning one right now and ask for
>your ideas: any fun/exciting/interesting activities related
>to knights, castles, wizards, kings, that kind of stuff...

Ben Delatour Scout Ranch used this theme for their camp wide activies
day.

Contests included archery, lance throwing, 'horse races' piggy back
jousting, fencing and quarter staff.

A "safe" sword can be made by using flexible pvc pipe (1") for the
core stiffiner.  Cover this with the prefab pipe insulation foam
which brings the exterior to about 4".  This is wrapped with duct
tape to hold it on together.  Bicycle greps can be used for hand
holds.  Some sort of helmet should be worn and a referee that makes
sure the match does not get out of hand.

A shield can be made from a foam covered round and held on by two or
three straps (two for the arm and one to hold onto).

A morning star (handle, chain & spiked ball) can be done using a foam
covered soft rubber ball on a cord attached to a foam covered pvc
pipe.

A mace (spiked ball on a stick) can be done as above (with no cord).

And of course the axes.  Foam covered pvc pipe with a foam ax head.

A nature scavenger hunt can be modelled on a quest for ingredients to
'potions' for Merlin to cure Arthur, Lancelot, etc.

A campwide capture the flag could easily have a medieval theme.

Be sure to get a juggler on staff! :)

You might have the staff volunteer to subject themselves to a dunking
chair in costume, labeled as 'FOOL'.  Tuanting the throwers with
things like,

"Thou art unworthy of thy missles." or "Me thinks thou must be the
fool to attempt to unseat me!"

A trumpet blowing competition with a suitably decorated bugle would
fit.