Go to the title screen, hold L+R and enter the following cheat codes:
Unlimited Canteen: Left, B, X, Down, B, A, B, X
Hyper Punch Mode: Left, Right, X, Up, X, Right, Left
Be Nicole: Left, Up, Down, Up, X, Up, Up
Pitfall 2: Lost caverns Mini game: get all the idols and buy all the items from the Shamans
Unlock Original Pitfall: X, X, Left, Right, X, B, A, Up, X