Surf's Up Achievement
Get 3 gold stars in Vehicle Surfing
In order to vehicle surf, simply run in front of any civilian car in order to get it to slow down and stop, in the same way you would hijack a car. Instead of hijacking it, hit to jump on top of the car. Obviously, the car must have a roof and be low enough to jump on top of. Get on the roof and wait for the car to start driving. When the game prompts you to, hit to start surfing. If you hit any sooner, you will hijack the car. You will then start balancing on the roof of the car, and a meter will pop up a la Tony Hawk. You can hit again to do a handstand, but all that will do is make it harder to balance. Use to keep your player steady. It will take 15-20 seconds to get three gold stars, at which point you will have to throw yourself off to end the Surfing session and get the achievement.