Down at the Mermaid Bar the owner's stock of ale is running low. Lets help her first by finding her. Starting from the Ruined Lifeguard Shack go south and take the boat to the other side of the island, then head east till the road turns, then head north till u hit a building with an inn sign on it. Except its no inn its the infamous Mermaid Bar talk to the NPC in green clothing to start your quest.
Now head out of the building and south you'll see a bridge going westward. Hop on the bridge and talk to the captain on the brown boat. He'll give you the shipment of ale. Head back to the Mermaid Bar for your reward.
Reward: 75 Gold