Stretching from Coraopolis to Clairton, the Montour Trail is a beautiful place to run, walk your dog, or to bike. The trail switches from paved to limestone, but it relatively flat the entire way, making for an easier workout. Along the trail's length, you'll find bridges, tunnels, and small waterfalls. For the most adventurous type, you can continue on from Clairton to McKeesport, where you can access the Great Allegheny Passage and trek all the way to Washington, DC.
For more information about the Montour Trail, visit http://www.montourtrail.org/