Hint: Easy hang time points:

There are two ways to get hang time points. The first is to jump off a hill or go up. The second uses hydraulics. To do this, you must first put your car against a wall. Then, start flipping the hydraulics until you jump. As soon as you jump up, immediately accelerate and use your nitrous. If done correctly, it should say "hang time" and give you some points. Unfortunately, you will not get points for the hydro jump.