The map here is pretty simple, for the Shipwreck. Get the Geocache (which is the sextant) Grab the two iron keys inside the lamps by the side of the door and use them to get the map from the hatch.
Once you have the map, head on over to the beach and get the spanish doubloon, as well as the two iron bars (found in front of the left barrel and the maraca).
Then make your make to Blackbeard's Home and get the treasure map by breaking the box to your right. Now - using the the rope on the tree branch - attach a magnet to it to get the rope. The Geocache here is the First Mate's Ring inside the bottle
Now on to Blackbeard's Cove. Here the Geocache is Blackbeard's Pistol; it's in the barrel. The Treasure Chest is hidden in a bush, so burn that. The figurine is also hidden in a box as well as the pocket watch. Now the key you need is just below Blackbeard's belt, but you need to dust it first. Finally, for the coin - use the cannonball stuffer on his hat, then on the right cannon.
Begin at Oak Island NS, where you'll need to look for items like the Gold Serving Plate by burning bushes and breaking boxes around the entrance. When you've gathered all your materials, place the dynamite at the entrance and and place the fuse coil around it. Light it up and watch the entrance go BOOM!
Once you've cleared the path, you'll finally enter Blackbeard's Cave. At the edge by the right is his hat, which is the Geocache item for this map. Break the rock and the bottle to get the whale and a key that you need. When that's done, let's focus on the puzzle. The goal here is to create a path to the three chests. The first row will be for the first number of pilings, which basically just continues on. You'll have to replace each dock piece before fitting your combination in.
For the left chest, use the silver key and the combination 3-3-1-2-1-3. The right chest needs the bronze key and the combination 1-2-3-3-2-1. Finally the center chest uses the gold key and the final combination of 1-3-3-2-4-3. All the chests will be empty but don't worry; get to the opening and use your lighter on the gold bowl and voila, Blackbeard's Treasure!