Dublin Hoard Map
Inside a cave at the shoreline, south of Dublin Town.
The map is inside the locked cave.
The key is inside the water, right by the pier.
The map shows an arial view of a place someplace in Dublin.
There is a field east of Rathdown that looks just like that.
Go to this location to pick up the Treasure.
Reward: Na Pucai Scheme (tailpiece)