This glitch quickly transports you on top of the ship in shipping port. First, align yourself with the front of the boat. Second, stand with your back facing the building next to the front of the boat.
Third, run towards the front of the boat and lay down, (you have to lay down while you run) so that your ribs will hit the corner of the curve in front of you.
Then your character will instantly transport onto the top of the boat. (note - it may take a while to get the glitch to work, but after that, you will be able to get up first try every time).