Bonus Track: 

On any track do the following... 

At the first ramp do an easy trick - SQUARE, TRIANGLE. 

At the second ramp do a medium trick - SQUARE, CIRCLE,
TRIANGLE. 

At the third ramp do a hard trick - SQUARE, CIRCLE, X. 

At the forth ramp do the following - Square, X, 
Triangle, Circle. 

Then finish the race and the bonus track will load.