1) From the boat, go up the steps and turn left. When you get to two sets of stairs take the one that points back the way you came. This will take you to the bridge. As soon as you open the door charge in and run up behind the hostage and shoot the guard. Then shoot the other two guards. This will take a little practice and it might be easier to come in from the other side so try that.
2) After everyone in the room is dead select your bomb defuser and defuse the bomb on the bridge.
3) After you the bomb is defused turn around so you can see all the doors. Go in the third one over from where you came in. There will be a bullet proof vest in there. Get it and then go back into the bridge. From the bridge look at the doors and go through the door to the right of the one you just exited. Go down the stairs and then up the other stairs. Open the door and turn left. Go down the stairs and turn right. Run straight until you go through a passageway. Turn right and head down the stairs. Shoot the guy at the bottom of the stairs. Turn left and then you will see a door on your right, but instead of going in it turn left again.
4) Open that door and shoot the two guards who are holding a hostage.
5) Then follow the passage way until you see a guard and a hostage. Shoot the guard and then open the door infront of you. When you open that door there will be a few guards, shoot them and go through the door.
6) When your through the door. You will see a guard to your right. Shoot him and go towards the engine bomb. Defuse the bomb and turn around. Go back out the door you just came out of and go up the stairs. U-turn to the right and kill the guards there. Go through the door behind where they stood. Kill the guards there and then go through the other door. Open the garage door and go out.
7) Select tracking bug and put it on the helicopter. Then turn left and run up the stairs go through the hall and down the stairs on the other side. Once on the ground head for the ramp you took to get on the boat and get on to your motor boat.