How do I unlock a map to get to these? Or whatever it is I need to do.

You need all 9 treasure map pieces.

[Item=Uncharted Land Map Piece ] [item=Uncharted Land Map Piece ] etc...

Once you collected them, go to Games -> Treasure Maps. There you can put them together under 'Omen Island' and get access.

You need to put together the Uncharted Land Map on the Treasure Maps page [item=Uncharted Land Map Piece ][item=Uncharted Land Map Piece ][item=Uncharted Land Map Piece ] [item=Uncharted Land Map Piece ][item=Uncharted Land Map Piece ][item=Uncharted Land Map Piece ] [item=Uncharted Land Map Piece ][item=Uncharted Land Map Piece ][item=Uncharted Land Map Piece ]

Thank you both!