I believe Will is right about Laurel Highlands, and not only that you must stay at the designated site, but that you must stay in the lean-to/shelter at the site and not set up your own. This should be checked.
The Susquehannock Trail System is a great hike as well, though it's 85 miles overall you can shorten it. Beautiful scenery. You could even cobble your own together as the STS and the Black Forest Trail run close enough together with attaching trails.
If you're only doing 10 miles per day, the 42 miles of the Black Forest might be quite good, as there is a LOT of elevation gain and loss, it's one of the tougher trail in PA, but well worth it.
Loyalsock is 60 miles, and again a beautiful trail. I really enjoyed doing the trail this past summer - it throws a lot of looks at you.