Three Australian computer game champs, Tyler, Marty, and Alison and one Fijia...
Pirate Islands: The Lost Treasure of Fiji
Season 1 Episode 8: Cross and Doublecross
Marty convinces mutineers 'captain' Lily to let him off cabin boy duty - endless chores and knife target practice with the boy as target - to get a piece of the treasure map from gullible brother.