Honestly I'm surprised there's not more pirate themed entries given how well coins and pirates go together! This is a well written little coastal adventure that captures the atmosphere and theme well, and I do like how you've included multiple points of interest and sources of information to arrive at the same point depending on player actions. Also enjoy the intrigue of the Stormcopper losing its power, but becoming a mysterious map if taken to land as a nice potential adventure hook for the future!
I kind of wanted a bit more about Harbourmaster Vaughn and the creature that Sturm Bloodsides serves, but I get that words are at a premium here and most DM/GMs can fill in the blanks.