In addition to Al Shaheed Park, Boulevard Park is the major green space in Kuwait City for a long-ish distance run. The Boulevard is a large entertainment complex located in Salmiya, an upscale residential & commercial district in the southern part of Kuwait City. Within this complex, the Boulevard Park features lakeside trails, including a ~2 km perimeter walking track that’s popular for running. There’s a small lake, tennis courts, and other recreation facilities. Bonus: Lit at night.
We recommend combining The Boulevard with the Corniche waterfront path. The closest access point to the Boulevard is at Marina Beach, ~ 1 km away using Quatar St.