From the Super Mario Wiki
Sunshine Isles is a multiplayer level and an extra level added exclusively to Super Mario 64 DS, located in a painting inside the Rec Room. In the regular mode, it has five Silver Stars that the player must collect for a Power Star. The music played on the level is a cover version of the Delfino Plaza theme from Super Mario Sunshine. The level has a group of islands, which are connected by shallow water. In the multiplayer version, it is one of the four courses, where players must fight to earn stars. The music has been changed, there are no enemies, and a yellow box that had a green shell now contains a feather that can be used by character, like The Secret Of Battle Fort.
The player must collect the five Silver Stars to make the Power Star appear. Silver stars are scattered throughout the isle, including inside a cavern or on the top of trees. A Klepto is also holding a Silver Star and the player must intercept the Klepto in order to gain the Silver Star. If the player touches an enemy, the player will lose one Silver Star that will jump around, just like how they do before the player obtains one.
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