Misi 3 GTA: San Andreas

Funny License Plates
If you import a car at the docks, most but not all cars have plates that differ from normal ones. One says "our fergie", or "disco stu", and a really special one says "ea sucks". Try it out.

Jesus Saves
In Los Santos there is a wall painting with a heart, Mary and an angel on it and it says: Jesus Saves. In GTA 1 and 2 on the buildings where you saved it said the same thing.

Gant bridge easter egg
Get a jetpack and fly to the top of the gant bridge. At the top is a sign saying: "There are no easter eggs up here. Go away."

CJ Sings
If you leave the game on and don't do anything CJ will sing songs heard on the radio. The songs you will most likely hear CJ sing is the songs on your favorite radio station.
GTA: San Andreas Secrets
Sex Toy Weapon
In Los Santos, go inside any police station and go into the shower room. Inside you will find a purple sex toy you can use as a very powerful weapon.

Infinite Photos
First, save your game (with a camera). Now, press L1 to take pictures of any photos you want (save it in your gallery), until you're done photographing. When you are, reset the console. The photos you have taken will still be in your gallery, only you won't have lost any film!

Fast and Easy way to upgrade weapon skills
Take the gun you want to be upgraded and aim it at a tire of any vechicle. Then just keep firing and your skill builds up quick.

Use the Vortex as a Submarine
Use the Vortex between El Quebrados and the abandoned airfield to take the small unique jump ramp that's on the back of the small shack it's parked next to. When you land in the water, the unique jump slow-motion cinema should keep going, with the camera fixed in one spot. Drive way out into the reservoir, and towards the dam, to the left of the camera's view. You'll disappear from view, but keep going. Eventually you'll run into the side of the dam and the cinema will end, leaving you under water and able to steer the Vortex like a submarine, without draining lung capacity or anything, as if you weren't underwater at all.

Chilliad Challenge easy win alternative way
Another way to easily complete every race in the Chilliad Challengeis quite simple, throw a grenade at your opponent(s) and they will be eliminated from the race. Normally, using a weapon will get you disqualified, but using a grenade is fine by the games standards, and this method is a lot less cheap than the other one for this challenge, and works just as effectively.

Get No Stars While Blowing Up Vehicles
In a helicopter you won't get any stars if you use the chaingun for blowing up cars instead of the rockets. Even if they're right behind the guy you're shooting. As long as you don't kill any pedestrians or hit a cop car with a stray bullet.

No Timer on Quarry Mission
On the mission where you have to steal dynamite for a Wuzie mission you normally have a timer but if you go to the center of the construction site there is a grey stage with a person on it and the dynamite plunger right in front of him. If you kill him the timer will stop and you will have all of the time you need to complete this mission.

Easy High Score in the Arcade Game "They Crawled From Uranus"
Once the game starts simply hold the joystick in one direction and the aliens' fire will never hit you. If you fire while doing this you can easily rack up points without ever dying.

Get out of debt trick
To get out of debt, no matter how far you are in, find a Unique Stunt Jump that you haven\'t been rewarded on yet. Hit the jump and you will be rewarded. However, this causes your money counter to reset to all zeroes.

Free ammo without pay purchase
Enter an ammunation shooting range and then press triangle to leave it. Gives full ammo to whatever gun you had equipped.