It’s superyacht summer for Sydney Sweeney and Scooter Braun. The couple was snapped boarding billionaire businessman David Geffen’s luxury superyacht in Mallorca, Spain, Friday, in photos obtained by Page Six. The sporty actress and the music executive then enjoyed a day of jet skiing in the crystal blue water. Geffen’s massive superyacht “Rising Sun” is valued at approximately $400 million. Sweeney, 28, wore a white blouse, yellow shorts and brown cowboy boots as she boarded, while Braun, 45, dressed more casually in a white T-shirt underneath an open light blue button-up with brown shorts and a backward royal blue baseball cap. The…