The Jordan River Trail is a biking/walking/running and more paved trail that goes from Utah Lake in Lehi to Davis County above Salt Lake.
It is popular for recreation at any point along it, you can start at any access point and end at any access point so it can be as long or short as you want.
- https://myjordanriver.org/ has a great interactive map.
Here are some of the parks are trailheads along the trail that I have documented:
Salt Lake City Section
South Salt Lake Section