If you go to the S spot, you're on a drive-by mission. You get into the car with your friends. You're heading over into Balla country.

NOTE: if you leave the car they assume you've abandoned them and they take off without you - mission failed.

You go through four different drive-by spots, in each one just go forward and backwards until all of the guys are shot. Once you're done with all of the shooting, you are now a 2 star wanted level.

Drive over to where the yellow spot is marked, back by the original restaurant. You have to go in to get your car repainted and lose the wanted stars. Wait there until the stars stop flashing and then drive back home.

Mission passed!
$500
respect +

Grand Theft Auto San Andreas Walkthrough