Place the pirate toys into the aluminum pan.

Add a few drops of the blue food coloring to the water until it is a lovely ocean blue. Pour the water into the aluminum pan. Place the pan into the freezer overnight.

Remove the ice from the pan and place it on the ground outside.

Allow your little pirate to try to remove all of their treasures for an ice block with the hammer first, and then once you're a bit pirate has gotten it broken down to smaller pieces, you can give them a cup full of warm water to slowly pour over the pieces to help melt the ice.