Mo Money, Mo Gyros:

If you need alot of gold and/or Gyros and don't have a Game Shark, you can start off in the town of Elle and travel back and forth between this town (Hera's Temple) and Sparta. Each time you leave one town and go to the other that town will reset. Gold, items, everything. This is an easy way to get 99 Gyros and 99 gold.

CPU Controlled Jason:

Start a two player game, and pick Atlanta and Herc (You need 2 players!!). Then, after you beat Hades and do all of the tasks for the rest of the Gods, go back to Hera. Go to her and she will talk to you. Do this for all the Gods and then go to Egypt. The first Martian you kill will die and come back to life as Jason! He will now be controlled by the computer. He will follow you around and help you. And he's Invincible, so send him head first into battle!