How do you beat the level mysterius hotel delphino?

To get the shine here, you need to find the pineapple to feed it to yoshi then get into the ventilation shafts to drop to the shine in the pool.

To get the pinapple:

1. Go to the left bathroom.
2. At the final stall, jump where it looks wet.
3. Spray the picture with the trees, when it turns into a picture of boo, jump through it.
4. In this room spray the walls (at the far end of the room) until they make a picture of boo. Go through.
5. In this room fill up on water if you need it. Spray the pink ghosts and use them as platforms to go through the hole in the roof.
6. In here stand back and spray the cabnit. Walk under before it closes.
7. In this room walk foward four or five tiles you should see a square (tile) that is lighter than the others. Stand over it and ground pound.
8. In this room break open the crates to get the pinapples!
9. Walk out the door and jump down a floor to feed it to Yoshi.
10. Once you've got yoshi climb the stairs to the top floor and go into the room with an open door.
11. Use the bed as a trampoline to go through the hole in yhe roof and get into the vent shafts.
12. Walk around eating ghosts if you need to. You will find an area with a cracked tile ( there are 2 or 3 ). IT IS NOT THE AREA WITH FIVE COINS! Once you find the area ground pound on the cracked tile to get to the shine.

Yay! You got the shine! Good job! You should be proud.