A good way to meet local runners is to participate in a parkrun. Växjösjön parkrun is in this area.
Fylleryd 4.8km is a hilly route with a gravel/dirt surface in Växjö. It could be suitable in the winter time as it has has electric lighting.
Fylleryds naturreservat is a hilly running spot with a soft surface.
Växjösjön has a soft surface for those who like to avoid the asphalt and concrete.