Local here. Gravel bike is a good call for an early, solo ride. Road to Poolewe, then good private road / track to Kernsary and Bad Bog. Mountain bike – drive up to the inappropriately named red stables (it’s now green….), just beyond Loch Bad an Sgalaig. The track heading south from here into the hills is pretty rough and rocky in places these days!
Not really any options with a 9 year old in tow from the door. Up towards Kernsary from Poolewe would work though, possibly even as far as Bad Bog, but there is a fairly steep hill. Heights of Kinlochewe from Kinlochewe could also be good.
For a full day, Corrie Hallie to Poolewe through Fisherfield (the “Trans Fisherfield”) takes some beating, but it involves some vehicle logistics. When are you up here? I’m always up for that ride.