Pretty much covered above.
Not much singletrack.
A few steep climbs.
Take the High section alongside Loch Ness. The views make it worthwhile.
Expect to be pushing up a couple of bits.
Remember to pop into the Eco Cafe at Abriachan.
There’s a new path out of Fort Augustus, up the hill. It’s a fair pech.
At Dores, avoid the SLNT. Swing past Camerons tearoom and go along Glen Liath to pick up the SLNT again before Inverfarigaig. This avoids a short section of scrambling.
Once you get to the outskirts on Inverness you can pick up the cycle track alongside the new road, take that to the Ness Islands and only have a few hundred metres or road to take you to the Castle.