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Gamecube - Spongebob Squarepants - Revenge Flying Dutchman cheats

Jelly fishing gear outfit
At the Krusty Krab, body slam the target. A tent will appear.

Mermaid man outfit
In downtown (construction site), deliver Krabby Patties to Patrick. 

Reep blower outfit
Win 1st place in the 100 jelly fishing contest.

The Dutchman's Graveyard: Extra lives
When you are getting "booty", look around where you find the booty. 
Whenever there is booty, there are some lives.