Super Mario Sunshine Unlockables (GameCube)

Super Mario Sunshine is a platform game developed by Nintendo Entertainment Analysis and Development and published by Nintendo for the Nintendo GameCube. It was released in Japan on July 19, 2002, in North America on August 26, 2002, and in Europe on October 4, 2002. It is the first 3D Mario platformer since the release of the predecessor, Super Mario 64, six years earlier. Super Mario Sunshine's successor is Super Mario Galaxy, which was released for the Wii in 2007.

The game takes place on the tropical Isle Delfino, where Mario and Princess Peach are taking a vacation. A villain identical to Mario, known as "Shadow Mario", vandalizes the entire island, and Mario gets blamed for the mess. Later on, Mario is ordered to clean up Isle Delfino, while saving Princess Peach from Shadow Mario. (Wikipedia)

Unlockables

New ending screen after credits - Collect 120 shine sprites.

The Secret Nozzles
Follow these instructions to unlock FLUDD's remaining Nozzles.

Rocket Nozzle - Collect 30 Shines (NOTE: you can only unlock this after unlocking Yoshi and the Turbo Nozzle)

Turbo Nozzle - Collect 25 Shines (NOTE: you can only unlock this after unlocking Yoshi)

Unlock Delfino Airstrip
When you have finished the story, speak to the Pianta on the docks near the entrance to Ricco Harbor, and give him 10 coins. He will take you to the Delfino Airstrip.

Delfino Airstrip - Finish the story, and give the Pianta in the docks in Delfino Plaza 10 coins

Unlock Sunglasses & Hawaiian Shirt
Both of these items are given to you by the man wearing sunglasses.

Hawaiian Shirt - See the man wearing sunglasses after completing the game

Sunglasses - See the man wearing sunglasses after obtaining 30 shines

Unlock Yoshi
To unlock Yoshi, you need to beat episode four of Pinna Park.

Here's part 1 of the game's speedrun: