Change Your Colors- At the character select screen hold the analog stick up an your outfit and the Jet-ski will change, then press the A or B button to choose your character.
Turbo Start- Press and hold the gas button right before the announcer says "Go". If done correctly then you will get a burst of speed.
Quick Recoveries- After a wreck repeatedly press A to get back on faster. This will save you some valuable time.
Ride the Dolphin- To ride the dolphin you must do every stunt in dolphin park and go through every ring. However, you can only ride it during the warm-up mode. Below is a list of all the stunts.
-handstand
-ride backwards
-stand with backflip
-backflip (off ramp)
-barrel roll in both directions (off ramp)
-dive (off ramp)
If done correctly, you will hear a dolphin squeaking as you pass the finish line. Now reset the system and you will see people riding around on dolphins in the intro. Select Normal Championship, and then choose warm-up. While picking your rider, hold down on the control stick. As you start you should be on the dolphin.
See the Giant Dolphin- At Dolphin Park select Warm-Up Mode and follow the dolphin. After 3 laps you will see 2 babie dolphins show up. After 7 laps their will be 3, and after 20 laps the giant dolphin should appear. For this trick to work you must follow very, very closely without slowing down or stopping, if you mess up at all the lap won't count. To tell if it counted, he should do a flip over the bridge at the beginning of the lap. All laps must be done consecutively, and if one doesn't count you have to start all over.
Extra Stunts:
Double Flip- Near the Peak of the ramp tap up for a second then hold down untill you've completed 2 full flips. This trick is worth 2,000 - 3,000 points
Helicopter Trick- On the ramp press up-left or up-right and hold untill you're ready to land. This trick is worth. 1,500 - 2,000 points.