Looking for Barbossa
At the beginning use Sparrow and Elisabeth's skills. First Jack needs to activate the mechanism with his sword.  Lizzy uses the spread bridge to get on the rock shelf. 
As Elisabeth get on the bridge on the left and lift the winch.  Put it in the mechanism and use it. This will open the passage for Jack. 
As Elisabeth get to the other side using the green bars.  Jack can use his hook to follow. 
When the characters meet jump to grab the chains above their heads.  Move along to the place lightened with moonlight. Draw the enemies here and defeat them (only when they are lightened!). 
Build the helm using the bones of your enemies  and use it. 
As a default character go across the bridge to get on the rock shelf and take the torch.  Switch to the second character and use the helm once again. 
Go back to the first character and turn left behind the bridge. Fire up the cannon.  Shoot at the three pairs of steel pillars. 
In the corridor use Jack's compass to find the upper object.  Use the spade to dig it up. 
Put the object in the given place on the left.  You need to put two mirrors into the moving mechanisms. The first one is against the wall. 
The second one is in the chest on the left (you need to hit it).  Move the pillars so the light hits the skull. 
While fighting Barbossa you need to hit him few times when he is lightened.  When he starts running away chase him and hit him in the darkness (it is the only way to hurt him). 
The main opponent will escape and you will be attacked by his companions. You must kill them when they are lightened so you can get their bones.  After eliminating all pirates create a barrel using their bones and use it to roll onto a mechanism. 
Barbossa will come back. Repeat the fighting scheme waiting for him on an small island on the left.
While you are on that island wait for the rest of the pirates. Fight them again in the full light. After killing all of them create a climbing wall out of their bones.  Climb the wall and ceiling and get to the shelf where you will press two switches. 
Fight Barbossa for the third time. This time on an island on the right. Hit him when he escapes into the darkness.
Fight the pirates on the island on the right.  When you eliminate all of them use their bones. 
Throw the ax at the target above you.  Jump on the rock and get to the other mechanism in the wall. Press two elements. 
Chase the opponent omitting  or jumping over the holes. 
At the end of the way you need to hit Barbossa few times. Pick up the coconuts and throw them at the pirate.  Switch to the other character and attack. Repeat as long as needed.