You could go over the mountains. Go up to Great Lake and then down to the Derwent Valley
Yes, paved. Go Longford, Cressy, Great Lake, Bothwell and then down to Derwent Valley
They aren't too bad in my small car, but a bike is different so I won't try to advise. One thing is that the road is very quiet
You can head to Westbury and then straight up. There's still a few bends, but no hairpins that I remember
Yes, paved. The road to Bothwell is paved, whereas the road south west towards Bronte Park isn't paved.