Equipment: ............One length of 2X4 timber, blindfolds.
Complexity: ...........Easy
Lay a long board flat on the ground (a 2X4 is best).
One by one, blindfold each pirate and have him walk the plank.
If he steps off at any point, he has fallen into shark-infested waters and is out.
If the boys find this too easy, turn the board on edge.
For variation, use two or more boards, side by side, and form teams for a relay race.