Dump this here.
So was checking out Epsteins island on Google and the whole Island has these trails marked out. Not on streetview, Just grey trails.

Ordinaryi you get these on private or unmarked roads if enough people are walking or driving along them with their cellphones. But who and how many people would even be on that island now? The nearby islands have no trails marked at all.

https://www.google.com/maps/@18.3109703,-64.8449566,5715m