Both of these items are given to you by the man wearing sunglasses. You can get the Sunglasses by obtaining 30 shines. You can get the Hawaiian Shirt after completing the game.
End Bonus
Successfully complete and save your game. Then you can pay 10 coins to use a boat near the clock tower where Yoshi is found to return to the Airport level at the start of the game.
Alternate ending screen
If you complete the game with 119 Shine Sprites or less you will get an ending screen in which el Piantissimo inspects the paintbrush. However, if you finish it with all 120 Shine Sprites, the ending screen will show all the characters in the game.
Finding coins
Find a patch of flowers and spray them all quickly. Four or five Coins will appear from the middle of the patch.
Raining
To seem as if it is raining, have the sprayer equipped and do a triple jump. Then, hold R after you land. Drops will be falling from the sky.
Select files with moves
When you are selecting a file you can do a Spin Move and the Side Jump to get onto the blocks.
Spinning jump
After jumping, you can do a spin by rotating the Analog-stick once in a circle.
Avoid losing health when falling
When falling from high places, press L to do a Ground Pound. This will make you fall very fast and not lose health.
Faster transportation
To make Mario get around a little faster, use the single spray nozzle and shoot a small amount of water in front of him. Run and press B to do a belly slide. He will slide through the water and keep going at a high speed. This will continue as long as you do not hit anything.
Swim faster
When swimming, switch to your hover and press R. It will give you a little boost while swimming.
Easy cleaning
Instead of taking a bath each time Mario gets dirty, do one or two spin jumps.
Get two shine sprites in Delfino Plaza
To get the first shine sprite, go to the lighthouse (not the lighthouse where you can get a shine sprite by using ten coins)and hover across the big blocks and jump into the tube.Then complete the mini level, it will get you a shine sprite.To get the second shine sprite, you will need the gray nozzle. There is a door with a shine sprite trapped,to get it activate your gray nozzle and run into the door, you should have it.
Bubba-Proof
In Gelato Beach and other levels where there are Bubbas (the big red fish that drags Mario underwater), you can keep them from doing this attack with this little trick. Pick up a piece of fruit and start swimming with it. It will enable a glitch where they cannot drag you. This is very useful for the Red Coin Shine in Gelato Beach.
Conserve Lives
To build up Mario's stock, try to quit stages when you are about to die. This would apply to stages like the racing stages (with the Islander who likes to race) and some of the mini-stages (like the Pachinko stage). If you can restart the stage easily (and quickly), you should learn to quit when Mario is in danger of dying. This will let you have a large stock of lives to tackle stages and mini-stages that you want a lot of lives to spend on (the Dead Leaf in a Dirty Brook mini-stage comes immediately to mind).
Return to the Airport
Once you've beaten the game (and saved your game), you will be able to go back to the Airport from the very beginning. It'll cost you, though. For the price of 10 coins, a boat close to the clocktower where you find Yoshi will take you to the Airport level -- which is filled with coins and fun stuff to do.
Get the first shine in Dolfino Plaza easier
The easy way to get the shine near the lighthouse in the pipe over the pillar things is to jump whenever you hit an obstacle and hover over/around the gaps.
Easy Lives
After you beat the game you can go to the Delfino Airport. When your there gather 100 coins to obtain a 1-up. Exit the stage and head over toward the cannon that sends you to Delfino Park. Dive in the water at the end of the street and at the sea floor is a hole with a free man. Get it and return to the Delfino Airstrip. it costs 10 coins which means you now have 90. Gather 10 more to get the 1-up and then leave. Get the one under the water again and keep repeating this trick for massive lives.
Water Splash Backflip
This code activates when you hold down the R Button and then press the A Button to make a big Squirt and a backflip.This code also works with yoshi but he does not do a backflip.