This level may take a few tries since you have to keep moving sideways, which is hard for the Skater due to his low maneuverability. However, this level shouldn't be too hard because the jumps are quite easy and not very long, except for the last one.
On the right side of the platform in front of you when you start the level, there is a small wall that you can go on. After that, you'll see another wall next to you. Go on the right side, as going on the left side will just take you back to the normal level area. Then, just follow the platforms, as the bonus is on one of them.