Great trail - Something for everyone, but be careful of hikers. Awful after it rains - sticky mud & poor drainage will wreak havoc on your bike. First part is flat, 6 miles out & back. After this, feel free to explore. Easy to put together a 4+ hour ride by exploring the park.
How to get there:
From Downtown Pittsburgh, take Parkway West toward the airport. Exit at Cambell's Run Road. Follow the signs to reach the park entrance. Follow signs for Tennis Courts, but DON'T PARK THERE - park next to the large playground and enjoy!