Pause the game and press Left, Right, Left, Right, Left, Right to unlock the Detective outfit.
Pause the game and press Down, Up, Down, Up, Down, Up, Down, Up to unlock the Swordsman outfit.
Pause the game and press C, Z, C, Z, B, A, B, A to unlock the Tattoo Vest.
Successfully complete all tasks, then go to Capital Island, and watch the credits. You will now have a special island named after your character.
On the elves island, place the pointer over the animals. Some of them have names like Buni Jovi (Bon Jovi), Bruce Sproingsteen (Bruce Springsteen), Bunno (Bono), and Toad Nugent (Ted Nugent).