Warehouse - this place is optional and can be accessed from anywhere in Day 5 except after you fight the T-Rex, I suggest going there, Click here to find out why. Go there and listen to the fat guy with his dog. Get the 2 treasures outside then go inside. There are lots of treasures so make sure you search carefully. Follow the path until you get to the crab boss. He is easy, just make sure your gun has rate of fire x3 or lower and stay at his side the whole time unless his eyes come out and shoot at you. If you have burst, attack the claws, but if you don't, attack the body. When he is dead, leave and continue the museum or sewer.
Go to Chinatown and get the charm from Maeda, go to the NYPD, give the charm to Wayne. Go back and this time go into the sewer. Go left until you reach a dead end, then get the treasure, go back to the intersection, go down until you reach a ladder. Go up the ladder, go right then down and watch the FMV with the slime (audience from Central Park). Go right then up and into the room with the electronics. Turn the power on, then activate pump 1, then pump 2 and watch the FMV. Activate pump 1 then turn the power off, leave the room and the water should be gone. Go right, in the door, up and then fight the centipede boss. I don't have any tips, just use your good judgement, he is hard the first time you fight him. Either explore the trains or go up. Get the key from the police guy and then insert disc 2 (in real life, not the game (good information for the world's retards (ha ha))). Go down, right, down and into the door.
Go to the museum and explore (I can't give you directions because it takes forever). When you find the room with the alarm, turn it off. Go into Dr. Klamp's room and watch Daniel beat him down (best part in the game). Get the key from Dr. Klamp and then find the Stegasaurus (go to the warehouse now if you haven't already). Find the T-Rex and kill it. Find Eve and whatever you do, DON'T LOOK AT HER!!! (you will thank me later). Watch the FMV and then kill the 2 parts of Eve. Get ready for Day 6.