Kids’ European Comedy Movie on island (I think) with villains/thieves

I’m thinking of a children’s comedy film, produced/released in Europe. I think it’s from the 2000s or 2010s. In it, there’s kids on an island hunting for some sort of treasure and they’re rivalled by a villainous duo (one woman, one man). The duo get knocked out at some point through sedatives, I believe.

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