Easier Putt in Minigolf:
     While  putting  in the minigolf course, hold down the walk button
and the aiming line will move a lot slower.

Tons of Reptar bars:
     While  playing mini golf, on hole eight run around to the back of
the large pyramid and go inside to find lots of reptar bars.

Cheat Text Files:
     Inset  the rugrats CD into your PC/Mac and open the up the folder
data,  then hints (\data\hints). In the folder are 42 text files, with
cheats, hints and tips.