Rake & Ruin and Pink Floyd from Birnam Hill are classics – not too scary even on my XC hardtail (though in the wet the roots are deadlier than anywhere else in the world at Dunkeld for some reason, and I’m sure it goes up a grade).
Gravel or easy XC / scenic riding – you can make a nice loop up towards Loch Cally and the 3 little lochans behind Atholl Hill, or up towards Loch Ordie.
There’s one particular “up and over” clockwise short section of landy track through a felled area of forest that is awesome fun – mildly rocky and steppy on bedrock and would probably be a blue/red singletrack if it was halved in width! As far as I can remember it descends down towards Rotmell loch from the SW. If I was local I would go and do laps of that regularly on the XC.
You can also ride the millions of forest roads with a lot of climbing from the Hermitage northwards towards Dalmarnock, and back alongside the river on the path there. Can get some incredible views. If you can go past the “Rumbling Bridge” after some rain you’ll be mighty impressed with the waterfalls.