The Laurel Highlands Trail follows a nearly level ridgeline in southwestern PA for 70 miles. My first experience on this trail was in 2001 when I hiked it with a few friends. This trail is great because they are shelter areas with multiple shelters and campsites about every 8 miles. The terrian is basically flat for the middle 60 miles, while the last five miles of each end drops over 1,000 ft back to the valley. Every mile of this trail is marked as well, which is a great resource that can be used to track your pace. During my first trip we spent 8 days out and had a lot of fun. A few years later I ran the whole trail with a friend. We started with a 37 mile day followed by a 33 mile day. There is also a Laurel Highlands Ultramarathon every spring. I'd like to participate in that race sometime soon.