One morein Broker first. Incidentally, it's worth saving your game at the safehouse every now and then, and making sure you load the right file as you don't want your jumps to be undone by an unsaved game.
Head across the bridge to the north (remember to pay the toll!) and you'll get to Bohan, the smallest of the four islands. There's a neat double-jump here for 14 and 15 - just remember not to go too fast over the first jump or you'll overshoot the next one.
Check the video for the exact lines you'll need.