Pipedream Course:
Win a medal on all Showoff courses to unlock the Pipedream course.
Untracked Course:
Win a medal on all Race courses to unlock the Untracked course.

Uberboards:
Unlock all of the tricks for a character to get their uberboard, which is their best board.

Alternate Costumes:
To earn more costumes, complete all chapters in your trick book. To unlock the final chrome costume, complete world circuit mode with a "Master" rank.