Location: This quest takes place in Darkshore.

Shortly: Serendia Oakwhisper in Lor’danel wants you to collect 16 Encrusted Clam Muscles.

How to: Just jump in the water there. The clams you need are in water, under the building.

The Rewards are 3 silvers, 50 coppers, 250 reputation with Darnassus and Diver’s Cord.