I'd like it if they could sail to some of the smaller islands around Isola, find clues on those islands, have a unification of the tribes, and have them find the island they came to Isola from. Maybe the mask in the preview pic could have washed ashore from one of the other islands.
or, on a different idea, maybe they explore Isola, and find a tribe of real Isolans.
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Will be back soon.