Hint: Instant Health Power-up
This trick worked in GTA III as well. Drive up next to a hooker and wait. If you're driving a swank enough car, she'll start talking to you. Eventually, she'll get into the car. At this point, drive to a quiet spot and let the magic happen. The car will start rocking, and your "health" will grow from 100 to 125. Your pocketbook will take a hit though. This health-up only works until the next time you die.
VideoGamer12
Hint: Super Speed in Tank
Turn the tank's turrent around so that it faces backwards, and repeatedly fire rounds to send the tank speeding.
Demion
Hint: "Easter Egg" Easter Egg
Head to the 8-10 VCN Building (the news building) on the west island of Vice City. The news building is by the northern bridge entrance on the west island. You can enter the door of the news building and head up to the roof.
Along with the news chopper, there's an easter egg you can get to. There's another buiding close by, but on an angle with the window closest to the edge of the heliport. Make a sprinting jump through the window and you should see an empty room with an easter egg in the middle.
Jared and Joey
Hint: Bullet Proof Cars
Admiral. Also fire-proof, explosion-proof, and collision-proof. Activate the Guardian Angels mission (from Colonel Cortez), and kill the Haitian gang members. The Admiral is the white car Diaz drives in the cut-scene. Deliberately fail the mission by killing Diaz, Lance, or letting the Haitian biker escape with Diaz's money.
Once the mission fails, the Admiral's doors will be unlocked and you can drive it back to the garage of your choice. Naturally, you will need to purchase property that has a garage first.
Sabre Turbo. Pick up a sniper rifle or assault rifle that allows Tommy to shoot through a first person view. During the mission "The Driver" (this mission is available only after certain conditions are met, primarily buying the Malibu Club) remain at the Malibu Club and wait for the Sabre Turbo come for the race. When it does, shoot the driver in the head and sieze it quickly before the cops come. The Sabre Turbo is faster than the Admiral, but is not collision proof.
Andrew Carvajal
Hint: Easier Flight From Justice (Cortez)
Once you reach the final mission for Cortez, it's a long mission of shooting boats and people, just do this: get 2 cars and park them in the pier next to the one to enter Cortez's missions, and put them in a way so that its practically impossible to get across through the pier (it's easier than it sounds), and go do the mission. When you start the mission a cutscene will come that shows a bunch of people trying to come through the pier you blocked, but they can't. They really would have if not done. Then you can relax on your boatride with Colonel Cortez. There may me a few people at the end but it makes life a whole lot easier since you saved yourself a lot of trouble of killing about fifty to seventy people. ---------------------------------------------------------------------------
Demion
Hint: Scarface Easter Egg
There's a Scarface easter egg in the form of a bloody bathroom and a chainsaw weapon.
Go to the Pay N' Spray at Ocean beach, then go south and take the first left. On your left, you'll see a two story apartment with two sets of stairs on the second floor.
Head up the stairs to the right and you'll see a black doorway. Check out the bathroom in apartment 3c and compare it to the movie.
Jake the Snake
Glitch: Drive Through Wall at Stadium
While you are driving any car, go to the stadium. There are two helicopter pads on the north side of the building. There is a wall near them that runs east to west. You can drive through this wall.
Jayson Valentine
Hint: Steal Bulletproof Sabre Turbo
When you are doing the mission, "The Driver," stay by the Malibu Club until you fail the mission. After you fail it, a Sabre Turbo will be parked by the Malibu. This car is bulletproof and locked, but you can still steal it. Take a car with good ramming power (preferably a Coach) and then push this bulletproof Sabre Turbo into your nearest garage (which should be the one at the Vercetti Estate).
orry
Hint: Airport Shortcut
There's a shortcut between Little Havana and Escobar Airport in Grand Theft Auto: Vice City. On the road beside the cafe, find an ally that goes towards the airport. If you drive down that alley, you can go through the hole in the fence. Now you don't have to drive around the airport. (This shortcut can be helpful when you need to save time during the paramedic missions.)
Aaron
Hint: Easy Money on Stunt Boat Challenge
On the first Umberto Robina mission, get in the boat and then press TRIANGLE to step away from the wheel. Attack Umberto's henchman, who's in the boat with you, until he's on the floor of the boat. Now every time you kick him, you'll receive the Good Citizen award of $50. Wait until your cash stops adding before kicking him again or it won't count. (You do not have to wait until the Good Citizen bonus message leaves the screen, however.)
Savvy
Hint: Faster Reload
To reload your guns more quickly, switch to another weapon and then switch back. Your ammo will be automatically reloaded whenever you switch weapons.
Mijit
Hint: Getting the Apache Chopper
For those who want to fly the Apache but don't want to get all 100 hidden packeges, get a cop uniform from the Washington Beach Police Department. Use any chopper to fly into the army base. Go to the northwest corner to find the Apache. If you don't have the cop uniform, the soldiers will shoot you out of the sky.
NullOmnivore
Hint: Easy Crazy Stunt Money
Get a bike and do a wheely. Keep the wheely going until you hit a lamp post or any other pole along the streets. If you crash at the correct angle, you should spin several times, thus gaining 40 to 100 dollars easily.
sscoolieo
Easter Egg: He Sleeps With the Fishes
Get a boat... and go between The "Leaf Links" Golf club and the third island. GO up to the rock and stop your boat get the sniper rifle in the cheat and look down on the rocks you will see a man in boxers with concrete on his feet.
IGN Guides
Hint: Porno Flyers
After you complete the mission that dumps porn flyers all over the city, the flyers will continue to blow around town as long as you're playing the game.
Farrar
Hint: Reduced Felony
If you want to kill cops without receiving a load of wanted stars in Grand Theft Auto: Vice City, use the main blade of a helicopter and angle it so that the blade hits them. You accrue less "wanted points" this way.