From the Super Mario Wiki
Bowser's Villa is a summertime villa that Bowser built on Vibe Island in Super Princess Peach, which looks very similar to his castle. It is the eighth and final area, and it is where Mario is being held. Bowser built his Villa in order to claim Vibe Island as his own.
To enter the final stage of Bowser's Villa, Peach must find and rescue all of the Toads in previous stages. In the final stage, the Army Hammer Bro is fought first, then Bowser himself in his normal form, then again in his giant form. Once Bowser is defeated, Mario will be rescued and the game will be completed.
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