Grand Theft Auto 3 Walkthrough:
Insane Jumps

There are lots of great jumps to do all over the place. You get huge money bonusses for doing them! It's usually best to get a fast car that you're good at handling. Often a Taxi can do the trick quite nicely.

* By Joey's on Portland, clear the roof
* right next to the fire station
* further left of the fire station
* left of sex kittens

Grand Theft Auto 3 Walkthrough