First of, thank you for making this game, I recently discovered it and have had so much fun with my old and new friends.
Just a few suggestions to small quests that would be easy as a solo-player just to get some experience.
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Shell-picking on beaches. Find rare or unique shells. As you find them around the map, it also unlocks them as trinkets/decoration when you have a full set for example.
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Dive for pearls and rare pearls (could be integrated with the shrine-quests. Or just by chance, like the shipwreaks)
Zilla
