The winner receives a three-course meal. Also, the Survivors all did better in their practice sessions than in the actual challenge. Notice that there are two different styles of boomerangs to choose from. The cross-section of a boomerang is like the airfoil on the wing of an airplane, with a round side and a flat side. One must always throw the boomerang with the flat side away from you.
Boomerangs do best with little or no wind at all.
Thanks to Aja for the vid-caps and drcheck for the analysis.