You can get from Namibia’s capital, Windhoek, to the coastal city of Swakopmund, in around 4 hours via a paved road with one lane in each direction.  Or you can head directly west from Windhoek, and you’ll quickly hit a gravel road (with a somewhat ironic “100 kph” speed limit sign) that provides a much more scenic route.  Provided you’re not in a hurry, the experience is much more rewarding visually.  Just make sure you don’t break down – odds are you won’t see anyone else for hours, and you won’t have cell phone coverage.  Bring plenty of water and sunscreen…