Captain Kelly Gordon has worked on superyachts as long as 160 feet.Ryan Cohen PhotographyVacationing on a superyacht may sound like it's all Champagne and sunbathing.But before boarding a luxury vessel, superyacht captain Kelly Gordon advises keeping certain things in mind.Yachting is a summer pastime with risks and nuances for clients and crew.Jeff Bezos and Lauren Sánchez soaking up the sun.