This Activity is meant for Boy Scouts.
Decide for yourself if it is appropriate for your younger scouts or not.

6 foot rope for each scout

Have each patrol stand in their own circle, facing inward, with the ropes in the center.

Have each scout choose a partner across the circle from him. If there is an odd number of scouts in a patrol, the patrol leader will stand out or pair up with a patrol leader from another odd-numbered patrol.

On 'GO' signal, each scout grabs a rope and ties a bowline around his waist. He then joins his rope to his partner's using a Sheetbend. The partners then back apart until the rope is tight and then lean way back with hands stretched out above their heads.
When all pairs in a patrol are finished, they give their patrol yell.

A leader should check all the knots for correctness and then determine the fastest correct patrol. If a timer is used, time deductions can be added for incorrect knots.

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Another way of running the activity is to have all scouts choose partners and then line up in two lines, partners across from each other. As each pair finishes, check knots and give deductions. The fastest pair gets points for their patrol, and 2nd, 3rd, 4th place receive diminishing points. If partners are from different patrols, they split the points.