Isla Cruces level: Gold Idol location
When you get to the waterfall where enemies attack you, defeat them all. Then, walk into the waterfall. Behind the waterfall is a secret room with the gold idol.
Shipwreck City: Gold bars
This is the only level where you must go over an area twice to find the items. After you receive the captain's Piece Of 8 from the thief, you must go back over the area you traveled along to get to the thief (i.e. cut loose the rafts again and jump across). The second time you travel along this path, the gold bars will appear.
Unlock Swords
The following swords are listed by order of strength. Complete the indicated task to unlock the corresponding sword.
Barbossa
Complete Shipreck City in Story mode.