if u wanna explore liberty city then while doing the mission (saint marks bistro) once you get to the outside part of the mission do the jet pack cheat, (l1,l2,r1,r2,up,down,left,right, and repeat once.), fly over the walls and explore, HAVE FUN
2 find leather face and ask san andreas questions, go to my site http://www.freewebs.com/liam_11cheats/