There are offseason vacations, and then there are Maria Sharapova's offseason vacations.

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The five-time Slam champion spent some time with billionaire Richard Branson on his private island, where they taught one another tennis and chess.

Playing tennis can't be too relaxing a holiday for a veteran tennis player, but Sharapova's attire indicates it was quite casual.

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And she found plenty else on Necker Island to do.

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Branson will get to use Sharapova's tips at this week's Necker Cup pro-am, which is set to include Serena Williams, Caroline Wozniacki, Eugenie Bouchard, Tennys Sandgren, Tommy Haas and more.

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The Necker Cup's "Participant Experience" costs $115,000 per couple.