You always believe the latest thing presented to you, no matter how ridiculous. It was obviously the very same time travelers who masquerade as pyramid building aliens, whom are also responsible for Winnipeg, the Harlem shake, and the noble platypus. Getting all willy nilly with the coconuts, fuckin degens.
Just on statistics, it seems unlikely that in the period of time that coconuts have been floating around that they would only have made it there about the same time as explorers. Surely if they could make it there floating then they would have much earlier.