Delfino Square is the 2nd course of the Flower Cup in Mario Kart DS. As the name implies, this course is located in something of a town square. There are boxes scattered about the track that contain Banana Peels and Mushrooms when they are run into by a character or hit with a shell. It is preceded by Desert Hills and followed by Waluigi Pinball in the Flower Cup. This track makes a return appearance in Mario Kart Wii.
There is a shortcut on this track. As you come off of a bridge with a pier up ahead on the left, there will be a gap in the wall on the right you can go through. You'll need a Mushroom or a Star to get through it quickly and you'll need to make a sharp right turn at the end of it to stay on course after that.