You're in 'city singletrack' central up there, Mortonhall has all sorts of nice wee trails hidden away in the trees.
Head along to the garden centre and have a wee play on the trails parallel with the road. You can ride through the garden centre, take a gate on the left, and follow the paths up to the golf club. A bit of imagination and sharp eyes will reveal a few decent lines.
Head slightly further along to Mounthooly Loan, ride up and keep your eyes left/right, there's a few more wee trails that are good for a little play.
Following the roads further to Dreghorn and there's more stuff in the trees.
By the time you get to Dreghorn you're close to the Pentlands (whats with the 'Pooflands' joke? Is that just a really really really clever dig at the less than Alpine trails? 🙄 ) but you'd need a map or a guide to find the good stuff without ending up lost.
I'm injured otherwise I'd be glad to show you some trails.