Loch Ness Monster: See Squid

You can see the squid by turning right off the track immediately at the very start in free style mode. If you go out far enough, the squid will take you under and blast you back onto the track. Play the track in career mode. When you reach the waterfall, hold down the nose of your jet ski so that you submerge. You will pop up in a cave on the other side of the waterfall. Once you reach the start of the course on the next lap, the squid will be waiting there.

Sky Hi Dude

Go off the track as far as you can then a sea monster will eat you and spit you out and you go flying. It is especially funny on a level with ships if you hit them.

Waverunner Does 200 MPH

At the main menu, press up twice, down twice, left, right, left, right, X, B, X, B, and enter your name as "way to fast".

Ending Bonus

Successfully complete the game on the hard difficulty setting to unlock Steve as a playable character and the Bermuda Triangle level.

Cheat Mode

At the main menu, choose the "Options" selection, then hold R and quickly press Up (2), Down(2), Left, Right, Left, Right, X, B, X, B at the options menu. If you entered the code correctly, the "Cheat Name" screen will appear. Enter one of the following case-sensitive codes, then exit back to the options screen to activate the corresponding cheat function:

All courses 
Enter "Passport" as a case-sensitive code. Note: This also unlocks Steve and the 
Bermuda Triangle.

All characters 
Enter "AllChar" as a case-sensitive code.

All wetsuits 
Enter "LaPinata" as a case-sensitive code.

Cannot get knocked off 
Enter "TopBird" as a case-sensitive code. The CPU can no longer knock you off 
your SeaDoo, but you can still knock them off.

Maximum performance meter 
Enter "PMeterGo" as a case-sensitive code. Note: If you miss a buoy you will 
stall with this code on.

Hard tracks with normal AI settings 
Enter "Hobble" as a case-sensitive code.

Expert AI 
Enter "AllOutAI" as a case-sensitive code. The AI will run the best race 
possible. Note: This is already active by default on the hard difficulty setting.

All ending FMV sequences 
Enter "Festival" as a case-sensitive code.

Play Time Trials against a UFO 
Enter "IBelieve" as a case-sensitive code.

Play Time Trials against a miniature F-18 jet 
Enter "F18" as a case-sensitive code.

Play Time Trials against ghost of currently selected player 
Enter "SEADOO" as a case-sensitive code. Note: This is the default in the game.

Hidden Track

Collect 100 balloons in countdown mode.

Get Thrown Sky High

On the Arctic Level, find the moving ship. Try to land on top of the ship by doing a bunnyhop or somersault move and watch yourself get thrown into the atmosphere. You must land on top of the ship for this to work.