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Delfino Plaza is the capital of the sun-drenched tropical paradise of Isle Delfino. It serves as the hub world of Super Mario Sunshine, as well as the location of Mario's trial in that game. The town is inhabited solely by Piantas, large, colorful, grass skirt-wearing creatures that have palm tree sprouts on their heads.
Its most prominent appearance was in SMG4: Stupid Mario Sunshine when Mario went on vacation there. In the same episode, Bowser Jr paid SMG4: Stupid Mario Sunshine a visit.
As stated above, Delfino Plaza is the capital of Isle Defino. According to Bad Star's Back!, Isle Delfino, and by extension Delfino Plaza, is located somewhere in the Pacific Ocean.