Running on Srd Hill offers one of the better opportunities for some hilly, relatively traffic free running above the old city. Just off the Jadranska Cesta (main road), a switchback path leads up to Fort Imperial and Križ. After this nearly 800 foot climb over 2 km, there’s a lovely flat run along Srd. Ul, for another 2.8 km to Bosanka. There are great views from this street.
To access the path from the old city, best to take Ul. od Srđa from the North entrance to the city.