This will teach you how to get 6 Uber tricks as fast as possible on the Garibaldi track to get unlimited boost as soon as possible.

[edit] Steps

Knock someone down, right out of the gate. This will start the Uber Disk spinning.
Do two ubers off of the first jump. If you can jump early enough to land on the last "hump" and jump and do another quick uber, so much the better.
Get your third (or fourth) uber by treating the curve ahead of you as a jump instead of a turn. You should have time to do a quick uber.
Get your fourth (or fifth) uber by going into the blue shortcut next to the above turn, then treating the turn ahead of you as another jump.
Get the fifth (or last) uber by jumping off of the next jump after landing the fourth uber. Try to jump near the left of the jump as it is slightly higher. After landing this, ride off of the next ledge. The ledge after this will be your lat uber-ledge, if you do not already have 6 ubers.
If you do not have 6 ubers yet, do the last one off of the next ledge-it is the last ledge before the blue shortcut rejoins the main path.
You're done! Finish the race with your unlimited boost.

[edit] Tips

Don't get frustrated. If you can't land one of the ubers listed here, skip it and get the last uber on another jump.
If you can't (or don't want to) knock someone down, you can either perform 3 mistys or rodeos on the first ledge, before the first huge jump, or you can fill your boost bar on the first jump.