Wave Race Tournament Option:
Go to the Options menu and press the following buttons at the same time: X + Z + START. A new option named "Password" will now appear. Here, you can enter passwords to compete in official time attack challenges.
Submitted by: Barake
Load Screen Fun:
Whenever a new track loads (on the screen displaying the track name), try moving around the analog stick, you can stir the water and cause ripples while you wait.
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Ethnic Lagoon time attack track (Japanese version)
Enter "J784WMHF" as a password.
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La Razza Canal track
Successfully complete the game in championship mode under the advanced difficulty setting. Note: This track is named Aqua Maze in the Japanese version of the game.
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Strongwater Keep track
Successfully complete the game in championship mode under the expert difficulty setting. Note: This track is named Victory Gate in the Japanese version of the game.
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Weather
Successfully complete the Expert Championship in first, second, or third place to respectively unlock the weather conditions in Time Trial mode under the expert, advanced, or normal difficulties.
Alternate visualizations
Go to the options screen then select the audio settings. Press Z to change visualizations.
Alternate costumes
Highlight a racer and press Z at the character selection screen.
Ghost rider
If you want to make the rider appear as a ghost, press C-stick Up. Press C-stick Down to return to normal.
In-game reset
Hold X + B + Start during game play.
Arctic Bay track
Successfully complete the game in championship mode under the normal difficulty setting. Note: This track is named Cool Ocean in the Japanese version of the game.
Trial mode
Successfully complete tutorial mode under the beginner and master difficulty settings to unlock the "Trial" option on the tutorial menu.
Quick start
Press A immediately before "Go" is announced and the light turns green.
Double Backflip
Go to a big ramp and charge it while holding B. Then, enable your turbo, do the backflip, and hold it.
180 or better
Hold Left or Right off a ramp. You can also go to the secret area in Dolphin Park. Charge the wave with turbo and hold Down. Pull back to get some hang time then hold Left or Right.
Triple Backflip
Note: This is a sort of glitch so it will not work all of the time. It works off your landing. If you land hard enough at the correct angle, the upward buoyant force of the water on the Jet Ski will cause you to do a third Backflip. Go to free roam mode and then highlight either Nigel Carver or Serena Del Mar. Press Z and move the first green dot three slots away from the acceleration side. Then, move the second green dot one slot away from the tight side. Press A and go to Dolphin Park. Once there, go moderately fast (about 105km/h) and hit a double sided jump. Then, do a Double Backflip (follow the Double Backflip hint, but do not hold B ) but keep holding Back. If you are lucky, when you land you will do sort of a bounce and do another flip. Release after your first flip or else you will fall. It is possible to do two extra flips in a row (four flips total).
Flatspin
Turn while on a ramp. While you are turning, try to do a back flip at the same time.
Arctic Bay: Shortcut
After passing three icebergs and the long right turn, before the ramp, at around 2 o'clock you will se a discoloration in the mountain side. Run into that discoloration and it will open up the underground penguin lair. Bear right and you will see a reunion with all the penguins and a ramp. There are two shortcut options. Either go onto that ramp and dive, which uncovers one shortcut; or go straight, which uncovers a different shortcut.
La Razza Canal: Shortcut
Select a character in free roam mode and go to La Razza Canal. From the starting line, go straight then take a right. Next, turn left, then right, then make a U-turn. Once you get out of the narrow alleyway go straight. You will then turn left, go under the two bridges, and go straight. Next, take a U-turn to the right. There will now be two ways to go. Take the left way and go through an alleyway. Take a right and you will see a set of doors. Break through them. There should be a turn and then a ramp. Do not be surprised if you use a turbo.
Southern Island: Shortcut
After the shipwreck there is a wall to the left. In the middle of the wall is a hole. Dive to break the bars on the hole and go through it.
Strongwater Keep: Shortcut
On the second lap after the seventh or so buoy a gate will open up as you pass by. Dart into it, follow the short tunnel, then break the glass at the other end to get out.
After the large jump over the rocks, follow the right wall and find the patch of different colored wall, Break through it to reveal a tight S-curve short cut. Note: You will miss three buoys by taking this shortcut.
Free roam: Buoys
Select free roam mode and choose the Fatty and the Dolphin Park track. Go towards the mountain and you will see a ring of buoys. You may need someone fast, as it as hard to get to.
Submitted by: Barake
Lost Temple Lagoon: Shortcut
Towards the end of the track, as you are on the big turn, is a big brick wall. Run into the wall with your Jet Ski and it will break, giving you an advantage on the race. You can do this in any game mode.
In hard mode, around the middle is a small brick wall you can break through. Inside is what appears to be an ancient temple. If you go to the other side, you can get out with a commanding lead.
Ocean City Harbor: Shortcut
After the third jump (ramp), immediately before the fourth jump make a sharp right so that you can see a red gate guarding a tunnel. Go through the gate, which opens a very nice shortcut.