Go upstairs to leave the pier. After a few jumps you should land in the middle of Sagan Street.
Go to the Dargento Cemetery at first.
Take the Sapphire from the bench and go back to the street.
Go south avoiding or killing Lurkers to the place marked as Bait Shop. There is a passage in the fence on the left side of the building. Go there to save the game, take the Child's Drawing #15 and Pistol Ammunition.
Go south and when you pass the plank turn right to enter the Dargento Cemetery from the other side. Go to the Sun Garden area and then to the west. Look at the wall on the corner - you should notice some holes in it. Breach it with the help of your axe.
Take Garnet from the bench.
Go west and open the gate to Janus Garden.
Go south to reach the Overlook Penitentiary - you can't go inside - the gate is electrified so don't touch it. There are Lurkers, Smogs and Ferals wandering around so be careful. Go south to the Boiler Room. Kill the Lurker, take Health Drink ale leave it through the second door.
Go right (east) along the Koontz Street. You will find some very precious Rifle Ammunition.
Look at the map and go west to the Alchemilla Hospital. Take the Bloodstone from the eastern area around the Hospital and Serum #6 from the western area.
Go north along the Wilon Street. You can't enter Toluca Lake and Power so take a walk to the Toluca Lake Offices.
Kill the Lurkers and shoot the Feral. Enter the building.