How else will you find the treasure?
Tear the edges of some slightly rough plain paper/construction paper. Paint with a cold used teabag and drop on a few granules of coffee. This ‘ages’ the paper. When it dries paint on an island, ocean, mountains, volcano, trees, beaches, shoreline, sea monsters, galleons, compass and ‘X’ marks the spot. Or use clipart and glue into place. Add a pinch of flour for ‘authentic’ dust.