Ryd 5km is a hilly route with a gravel/dirt surface close to Mjölby.
Vallaskogen is a hilly running spot with a soft surface.
If you want to do more than just going out for an easy run there are some good options available.
A short trip away you can find the track Campus Valla that should be open to the public
Vikingstad motionsspår 1.7km has a soft surface and are not very far from Mjölby for those who like to avoid the asphalt and concrete.