No, I’ve not cycled there. I’d give the road along the coast to Kalkan a miss, its scary enough in a car. Head inland, the roads aren’t too bad, there will be epic climbs and incredible scenery. If the want it a bit flatter head west of Kalkan, there is quite a wide valley. Also maybe think about visiting some of the antiquities, they make what we have in the UK look like a pile of stones. Mostly around 2000 years old contemporary with the Romans. If nothing else they give the ride a destination and there’s usually a small bar or at least a hut selling cold drinks