Big Scores
In trick mode in any level you perform a simple move such as a flip.Before the commantor will say something you pause the game and listen to what he saids. Then unpause the game and don't do another trick for the rest of the level. If your successful when you unpause the game you won't see how many points you get for your move,and when you cross the finish line at the end then you shall see how many points you get.
Dolphin Code
Select Stunt Mode on the main menu, and choose any Jet Ski. Now, go to the Dolphin Park course. During the race, you must perform each of the following stunts while still passing through every ring: a handstand, riding backwards, standing and somersaulting back, barrel roll left off a ramp, barrel roll right off a ramp, flip off a ramp, and a submarine (diving underwater from a ramp). If done correctly, a dolphin will squeak when you finish.
Now, go back to the main menu and choose Championship mode with difficulty Normal, and enter the Warm Up. While choosing your Jet Ski, hold down on the control stick or pad, and press start. You'll now be riding on the back of a dolphin!
Reverse Time Trials
Unlock the reverse courses by getting first on expert. Once this is done, enter time trials and a new reverse option will be available. This offers time trial scores completely separate from those logged in on other difficulties. It only allows one high score instead of three, and high lap scores are not saved.
Big Scores...