Wave Race 64 cheats and cheat codes for Nintendo 64

Slide
Hit R to slide on the water.

Change view
Hit C-Down and C-Up to zoom. 
Hit C-Right and C-Left to change the camera angle.

Climb back quickly to jet ski:
Press A  several times after falling off the jet ski

Faster start
When you hear "Go!" at the race start, hold both accelerator buttons.

Change colors
While selecting a jet ski, highlight a character and hold Up on 
the Analog-stick 

Unlock Reverse mode option:
Win the game on expert mode, then start a new championship

Get bonus points
Pause the game play immediately after perform a stunt and right before 
the commentator speaks in stunt mode. If done correctly, you should hear 
only the commentator's voice. 

Get more bonus points
Cross the finish time as the clock reaches 0. 

Jumping dolphin
During the game, follow the dolphin around the course 3 times and try to 
mirror each stunt that it performs.

Killer whale
During the game, follow the dolphin around the course 20 times and try to 
mirror each stunt that it performs.