You see a map of unique jumps in GTA San Andreas. As the game progresses you can perform up to 70 unique tricks. All designated jumps marked on the map of 3 Islands of San Andreas. Unique jumps can be performed on any form of transport. To do the stunt in GTA San Andreas take a fast car or bike and properly accelerate. Thre is no way to do unique jump with tractor or bicycle cause you just will not accelerate to the desired speed.
Download: map of unique jumps in GTA San Andreas