Enter  "todamoon"  at  the "Enter Codes" screen under the options
menu to unlock the Rocket Garden track.

Cheat Codes

Enter the following at the Codes screen: 

TRAKMEET                Unlock all tracks 
WTCHKPRS                Slow-mo 
FTAIL                   Low gravity 
WHEELS                  Unlock all bikes 
LOKSMITH                Master code 
POPULATE                Unlock all characters 
YARDSALE                Unlock all costumes 
FLYSOLO                 No bike 
FIRESALE                Constant flames 
ALLFREEK                Freekout always full

Get Riders
     Unlock  Greg  Albertyn, Mike Jones, Jessica Patterson or Clifford
Adoptante by winning a challenge race against them.