Wave Race 64

Dolphin Ride

In stunt mode, go to Dolphin Park, ride through all of the rings and do the following stunts:
1.Handstand
2.Backwards Spin
3.Stand with Backflip
4.Single Backflip off Ramp
5.Dive off Ramp
6.Barrell Roll off Ramp in both directions

If you did the code correctly, you'll here the dolphin squeak when you cross the finish line. If you reset and go the title screen, you'll see people riding on dolphins.

To ride a dolphin, select Championship Race, normal mode. Hold down on the analog stick when selecting your racer. In Dolphin Park, you will ride a dolphin.

The code is perminant and even after you turn off your N64 it will still be there. So you can do it again and again.