"Liberate" the Dunfilgon Sow
Pirate Sickle likes pigs. New passion, some would say. The problem is, he keeps being shown up by Farmer Bremm, who lives a ways away in the town of Dunfilgon.
First, Pirate Sickle wants people to think he's legit. Second, Dunfilgon is considerably in-land and his pirate crew are just not up for work that far from a boat. Third, he wants that sow.
Maybe he tells the party it was stolen from him. Maybe he tells them it is his wife, polymorphed into a pig and he wants her back. Maybe he tells them that Farmer Bremm is a demon.
Whatever.
The party is to deliver to him the Dulfilgon Sow. They can buy it. They can steal it.
Who knows, maybe Farmer Bremm isn't the nicest guy either. Maybe he's secretly an evil druid and uses his contacts with the goblins of the woods to wreak terror on Dunfilgon. Since he lives within the walls, he's great and the other farmers near by get their livestock stolen by the goblins on a regular basis (the pirate, mind you, lives a ways away - few days at least). Hell, maybe Farmer Bremm IS A DEMON.
This is D&D, stranger things have happened.