Smuggler's Spit is a Bonus Quest. You do not need to succeed to complete this quest.
Story
Smuggler's Spit
"Ser/my [lord/lady], good news for us, if not for some. A smuggler's ship was caught in a storm. Cargo lies on a spit of land just waiting to be taken."
"Ser/my [lord/lady], while this was the property of criminals, in taking it you bring it under the provision of law. A property tax should go to Lord Renly."
[Your Sworn Sword] chortles in eerie unison with Simon Groat. "We set false tracks and sent all others to the wrong beach! We have all the cargo, Ser/my [lord/lady]."
[Your Sworn Sword] is waiting when Renly's guards arrive, signs of a brief battle clearly laid out in the sand. One of Renly's knights offers his compliments.
[Your Sworn Sword] is quick and decisive, bringing several crates of fine cloth and well-forged weapons back to [Your Hold]. [Your Sworn Sword] returns with a smaller selection of cargo than you would have liked, but it's all fairly fine stuff. "We got out just ahead of a larger group." Enter the text upon successful completion of the quest