By gaining friendship with the following people can benefit you in many ways.

Contributed By: jamin218, BreadSkin

Contributed By: lilobaggins, cchk15, RedStep

First, you’ll have to have access to Happiness Island. Once you’re able to go there legally, find the Helicopter Tours (which is directly east of Happiness Island) and steal a helicopter. Fly to Happiness Island and over the Statue of Liberty, then jump out of the helicopter at the statue’s feet. You should land on the topmost tier of the statue, which is basically a square platform with a door in the center of each side. Run around the platform until you see a door with a plaque on either side of it that reads, "No Hidden Content Here." It may seem like you cannot go through the door, but you can-- it doesn’t open, you simply walk THROUGH the door. Inside, you’ll find an empty room with a tall ladder. Climb it, and when you reach the top, look up; there is a gigantic beating heart, held in place by chains.

Contributed By: LEFBMIA

Get any type of car and go to a large traffic jam. Use the horn to do the "Shave and a haircut" and stop, one of the many other cars should do the "two bits". You must listen carefully because it might be done by a pedestrian instead!

Contributed By: nekoloverxxx101

Go to an ATM, then cause a traffic jam to the area. Wait for someone to take money from the ATM, then kill him or her. Make sure to block any nearby roads so the ambulance cannot get to the murdered victim. Take the money they dropped on the ground. Then, run a short distance away, and go back. The money should have respawned on the ground. You can repeat this as many times as desired. You can also kill more people taking their money from the ATM to increase the amount of money that respawns.

Contributed By: nwabu2

Go to the statue of liberty and walk up to the second level. Walk through the door (it doesn’t swing open, just go through it) and the game will load for a second and you will walk out with a new t-shirt with the statue of liberty on it.

Contributed By: vudumonkey25

If the vehicle you are driving breaks down and the engine will not start, call 911, and your engine should start again.

Contributed By: R351D3NT3V1L4

Enter the following password into the in-game computers. (NOTE: This URL does not work in a real web browser outside of the game. Please do not complain to us about it.)

Press up on your D-Pad to display your cell phone, and then press up again to access the keypad. Enter the codes and call the number. If done correctly, it should say “Cheat activated” in the top left hand corner.

482-555-0100 Restore health

362-555-0100 Restore armor

486-555-0100 Get a selection of weapons

486-555-0150 Get a different selection of weapons

267-555-0100 Remove wanted level

267-555-0150 Raise wanted level

468-555-0100 Change weather

359-555-0100 Spawn an Annihilator

938-555-0100 Spawn a Jetmax

625-555-0100 Spawn an NRG-900

625-555-0150 Spawn a Sanchez

227-555-0100 Spawn an FIB Buffalo

227-555-0175 Spawn a Comet

227-555-0147 Spawn a Turismo

227-555-0142 Spawn a Cognoscenti

227-555-0168 Spawn a SuperGT

948-555-0100 Song information

my understanding is all but the vehicle cheats disable achievements