Bangor Training

Anyone got any recommendations for lunch time training runs in Bangor. I will be working in Penrhosgarnedd and will be commuting in and out each day for 1 - 2 weeks. I've had a good look over the OS map and some reps on Bangor mountain up to the mast and down again seem feasible and there is a nice incline from Llandygai to Minffordd.

But local knowledge rules; so does anyone have any little gems to share. I'm looking for a hilly 5 to 10 km run or a 30 - 45 minute rep session both preferably off road.

Thanks in advance