At the Krusty Krab, body slam the target. A tent will appear and you will have the jelly fishing gear costume.

Press Start to pause game play, then hold L1 + R2 + Square + Circle (in order) to display the current level number at the top part of the screen. Press L1 to choose a new level, then press Select to resume the game at that point.

In downtown (construction site), deliver Krabby Patties to Patrick and he will give it to you.

In Jelly Fish Fields, win the 100 jelly fishing contest. Your prize will be the Reep Blower costume.
When you are getting "booty", look around where you find the booty. Whenever there is booty, there are some lives.

Before you jump on the Hamster Wheel, change into your "Fishing Gear" costume. Then, jump on the wheel and keep jumping until the timer reaches zero.