Sorry, but Google Earth and a bunch of other satellite users will still map out your now inhabited island.
A cave would in theory be better, but take plenty of vitamin D supplements and I have no idea exactly what you’ll be eating.
Actually, go for a tropical island. You may manage to hide from the satellites amid the foliage, while still having plenty of grub and shelter. Infra-red satellite imagery will still pick you up, of course.
