First escort yourself to the helicopter tours. Getting a taxi will save time. Once you arrive there go to where the helicopters are and you will see that there are NO security guards. Now all you have to do is counter the the people by pushing them then tappping A to dodge as soon as the person throws a punch. Stick to the men as the women punches are alot quicker. After they throw the punch repeatedly press the B button and you will see that he does a combo. Replacing B as X does a different combo i.e kicks. Another thing is that if you run low on health as you exit the Helicopter Tours there is a hotdog stall. It is better to get one before you enter. Good Luck!! :D