Donald Dettloff (USA) has 647 different surfboards, displayed around his property in Haiku, Maui, Hawaii, USA, that he has been collecting for over 15 years. His collection is widely known as the surfboard fence.
He started creating the surfboard fence back in 1990 with the forecast of a hurricane. He wired his boards to his fence to keep them from blowing away.
Comments below may relate to previous holders of this record.