Here's a hint: the secret to getting the Skull Pirate costume is hidden somewhere within the pages of Skullduggery Island. Find the secret code, and you can unlock the costume!
Additionally, if you visit the Skullduggery Island sample chapters, you'll find another surprise. Click the "listen now" button to hear the first two chapters as read by the honeyed voice of Jeff Kinney, Poptropica Creator and Diary of a Wimpy Kid author!
CAPTAIN CRAWFISH