Hmm, I’ve explored a lot of the paths in the area and not found anything worth going out of my way for.
There used to be a nice descent down to Duffield Bank near Makeney, but the techy rocky bit at the end got replaced with horrible backfilled wooden steps.
You could take that path, or go via the BW from Holbrook to the Holy Bush. From there, across to Milford and pick up the path past the sewage works, then back up to Chevin Road and over to Blackbrook. From there, you could head up through Handley Wood and pick up the top of Longwalls Lane.
From Milford though, I usually go along Chevin Road to Blackbrook, then Dalley Lane to Belper Lane End. It’s quiet, and the quickest and most direct route. It’s all good once you are up near Alderwasley as you probably know.
Also, the nice descent through quarry woods at Coxbench is off limits these days – the new landowner tolerated riders for a while, but has had enough of being told to eff off by people on bikes on his land :o(