I think the best bet for hiking/running trail is the huge trail system behind Sierra College. It's the schools cross country course and is used by many schools, both college and high school in Northern California. They took a chunk out of it a few years ago when they built the new parking lots for the stadium but the largest loop in the system is probably still in the 2 mile range. To access it park in the second parking lot north of the stadium on Sierra College Blvd. This will be the lot that it furthest from the stadium not the one that is right next to the stadium. It'll cost you a buck to park there but once you do just turn toward the trees at the edge of the parking lot and you'll find the trail.
Click on the satellite view and zoom in on the the second parking lot north of the stadium. You'll see the start of the loop in the upper right hand corner of the parking lot.
sierra college - Google Maps