If you've not been to any of the trail centres around Dumfries before…. then any one of them are good for a blast, I personally like them all and visit each of them to keep things interesting..
I believe there doing some tree felling at Dalbettie at the moment so their are diversions in place.
Drumlanrig has some good rooty techy sections in it and has some excellent fast natural feeling singletrack, i felt the red trail was a bit too short… so planning too give the black a shot next time
Mabie is excellent at this time of year too, lots of varied terrain with some good climbs and fast sections… there are some good wet rooty sections to be had too, plus they have a cool 4x track…. you can easily loose an hr on that
Kirrie is well worth the drive 😀