Hint: Beach Ball (Vice City)
On the Leaf Links golf course there is a sand pit with a beach ball in it. To get there go to the spot where you kill the golf player on the platform. Then walk diagonaly right, away from the platform, until you see the two sand pits. The beach ball will be in the bigger pit. Note: If you shoot it it pops, and might not come back.

Hint: Scarface Easter Egg
In Vice City, 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.