Pirates Of The Caribbean - At World's End - Platform: Xbox 360

Isla Cruces level: Gold Idol location: 
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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:
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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.