Kids are so resourceful. The kid fishing is using a fishing line wound around a piece of wood, with a hook on the end that he is baiting with some ‘thing’ that he is retrieving from his backpack. What would he have done had he caught something, I don’t know, but it would have been fun to find out.
Maybe they’re all cousins as they were traveling together on the boat, entertaining each other with games and jokes, and generally all, boys and girls together getting along so well.