Once in Tortuga, you get the main mission briefing from William Kidd: There is trouble brewing in Golden Lake. One of the Captains there is trying to take over the place and is already gathering men in a jungle camp near town. Captain Kidd wants you to find that camp and take care of that Captain - nobody but him names town bosses.
The main part of the mission is a swashbuckling fight against level 25 enemies in Golden Lake which takes place on a jungle map. You will have to walk into the jungle for a bit to find the first group of opponents. After you engage them, the rest will spawn in waves (three enemies to each wave) with a single Boss at the end. You should try to be quick about killing them because the waves spawn quite fast and it's relatively easy to get overwhelmed by multiple waves.
- Defeat All Enemies
- Defeat the Enemy Leader