Instructions
Start the game and select the "Story Mode" option from the main menu by pressing the "A" button on your Wii remote.
Complete each race and challenge until you reach the "Rustbucket Race-O-Rama" level. Finish in first or second place and you will move on to Ornament Valley.
If you don't want to unlock Ornament Valley by playing in Story Mode, click on the "Options" selection from the main menu by pressing the "A" button on your Wii remote. Select "Passwords" with your "A" button. Use your Wii remote to enter "IF900HP" into the "Password" field and then press the "A" button. All tracks and mini-games will now be unlocked.