I love driving over the Brecon beacons when there's nobody else on the road
I delivered a Porsche Boxster back from Swansea last summer. I came back through the Beacons as someone had turned off motorways on the sat nav (real shame that).... Stuck to 60 though obviously
I drive from Swansea to the midlands once a month and only take the motorway for about 5miles! Always take the Beacons unless the weather is reeeeeally bad.