If you´re after a few hours of constant corners, this is it :)
I believe this route is great on the first half, from Terme Vigliatore to Portella Mandrazzi; lots of nice corners and pleasant scenery.
I thought this route was great on the first half climb. The road is in very good condition with lots of switchbacks.
From the base of Mount Etna, the SS185 winds its way down to the coast through secluded villages. It gets rather narrow at times but its still an enjoyable ride.