This is how to get to staunton island without proggressing in the game. First, find a fast car such as a banshee. Next, type in the 2 following cheats.
R1,L1,R2,L1,left,R1,R1,triangle. "Better handling"
Now head out to the callahan bridge. Once you see it, back away extremely far away from it. Drive full-speed at the bridge, and when you get 10 yards away from it, hold the control stick down. You should repel yourself over the barriers. Now, drive full-speed towards you the gap in the bridge. When you get 10 yards away, hold down on the control stick.You should now be over the gap in the bridge. To return to portland, repeat the step.
Added by: constatine Apr 25th 2008, ID#29944