Use the hillphones – much of the routes I am suggesting are prime stalking areas and season.
A long day to be had doing the Loch Ericht, Dalnaspidal, Loch Garry day (more interesting than it may first look, and worth hunting the singletrack links hidden in the forest above Kilchoan rather than road).
A pop over to Bridge of Balgie via the Lairig Ghallabhaich is a lovely day. (But watch out for grumpy factor from the estate).
Black Woods of Rannoch are packed with ‘follow my nose, I wonder where this wee track goes’.
Some short routes in Forestry around Queens View area.
Pitlochry and area has many recorded routes.
Schiehallion is fun, if you stop at the start of the gert big boulders on the summit ridge…
I am sure scotroutes will confirm a couple of the tracks over Rannoch Moor to Kingshouse way.
Take a canoe. 8)