Key points of Map of Corozal - Assassin- Assassin's Creed IV: Black Flag
18. The Unworthy Brother
No reward for staying out of combat. The target is in the Chinchorro fort so, the basic condition is that you seize it. Enter the fortress. The target is in the inner yard, protected by gunners and pirates on both sides. Enter the restricted area from the East, make it over to the gunner staying there and eliminate him. Next, you need to locate the target with the eagle vision. Use the height to your advantage and kill him from above. At the same time, you need to watch out for the second gunner, who may spot you, and for the target's bodyguards. If you kill their boss with the attack from above, they will spot you straight away and kill you.
30. The Outlaw's Cave
To complete this contract, you are going to need the diving bell and, in the course of the mission, you will be stripped of your armor and most gear. The target is to the south, near the underwater location Ambergris Key. After you get there, near the shipwreck, you will notice an entrance worked into the rock, leading into an Aztec building. Sail up to the entrance and moor the ship, and Edward will dive in the bell. In front of you, you will notice a tunnel. Avoid the medusas and swim into the tunnel. Keep swimming ahead, while watching out for medusas and sea urchins, until you reach a large cave with Aztec ruins in it. Climb up the pole on the right of the stairs and eliminate the guard on top. The best idea is to use a throwing knife for that. If you do not have any, climb up when the other guard is gone, deal with the first one and hide around the corner. With a bit of luck, you will stay unnoticed. Your target is in the next area. Watch out for the patrol, sneak up to him from behind and eliminate him. In the room, there are a lot of ledges and beams so, the best method is to attack him from above. The stairs on the right will take you back out. Go aboard the ship, take the wheel and Edward will change into his regular outfit.