Cobbs Creek Park
There is one long multi-use trail that travels from 70th Street up to Market Street and it's about 3.75 miles long.
There are also three unpaved trail segments:
1) ~1.5 miles between Baltimore Ave and Market Streets - this trail is in need of upkeep
2) ~1.5 miles between Market and Race Streets, which goes through teh Bocce Woods section of the park - this is the featured trail in the Cobbs Creek 5K. http://www.cobbscreek5k.com/
3) ~1.5 miles in the northern section called Morris Park along Indian Creek. http://friendsofmorrispark.org/about/