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.
Easier Putts In Mini Golf:
While putting in the mini golf course, hold down the walk button and the aiming bar will slow down.
Put the game CD into a PC CD-ROM drive. Look in the data/hints directory and you'll find a ton of game hints in text format.
Thanks to Revolution readers Scott Knipfer, T.Roc, T-Dog, Neal, and Tony Nguyen!