Constellation Rockstar:

At night, there is a constellation of stars that makes up the Rockstar games
symbol. It is the R with the star/* at the end.

Sparrow:

Go to the roof of the building where you first started G Spotlight and there
will be a Sparrow parked there.There is
also one on the roof of a house near the Pay N Spray in Ocean Beach. To get
to it, go to the Collars And Cuffs in Ocean Beach. Then, go down that alley
where Collars And Cuffs is and there will be a parking garage on your right.
Go to the top floor and there will be some ramps. Before jumping, look around
and find the Sparrow and then jump to it. I'm not sure if you can reach it in
one jump or not so you might half to jump more than 1 roof. The parking
garage is also located near the Pay N Spray. It is white and has around 5
stories. For the easiest way, just get to the Pay N Spray in Ocean Beach.
Now, go to that place right by it with the parked PCJ-600 and Banshee (or
sometimes Cheetah's or Infernus's). Now, get the PCJ-600 and back up all the
way from the white stairs. Back up until you have crossed the street and have
went in the alley with the gray pavement. Keep going back until you reach the
shrubs. Now, punch the gas and go fast and hit the stairs. You need to clear
the first building and land on the second one. It is pink. The Sparrow will
be up there. There is also one across from the Links View Apartment. Across
the street from it is a building with an arched entrance that you can go in.
Go inside the arch, there will be some backyards. There should be a Sparrow
in the first one on your right.

Look At All The Sea Animals:

I forgot who first made this strategy, but if you go waist high in the water
along the coasts of the islands, you can crouch down in it and not drown. To
use this, use your sniper rifle and zoom in and you can see all kinds of
animals like sharks, turtles, jellyfish, and regular fish.

Make Decent Money Fast:

This is a really good way to make a quick $1,000. As it turns out, parking is
ridiculously expensive in Vice City. On a North and South running street in
Downtown on the second island (south of the Hyman Condo), there is a street
covered in parking meters (it may be a curved street, I am not sure). If you
run into them (or maybe use a tool like the hammer or baseball bat), you
knock about $2-400 out of them. The only problem is if you hit them too fast,
you will wrap your car around them and they'll get stuck in the engine.
Explosions are usually imminent. I don't think that this willful destruction
of private property even generates a wanted level so you're basically just
able to get decent cash with minimal effort.

Easy cash

To get some quick cash (fast cash)
1)just enter the cheat "panzer" get into the panzer and start police mission by pressing caps lock
2)then hit the cheat "bigbang".
Continue the step 1 & 2

You can make as much cash you want.