There is a rather empty road on Fuerteventura, the one that goes through Betancuria, in the mountains, to the south, FV-30. I can certainly recommend taking this route if you can: it's calm, outerworldly, with ravens visiting you at the miradors, showing all the beautiful mountains on the west side of the island.
(Oh, by the way: this entry was written by Peter Molnar, and originally posted on petermolnar dot net.)