How do you feel about staying in an AT shelter? The one on Peter's Mountain east of the 225 trailhead is really neat, like a cabin with a corner missing. It has a spring but that's a couple hundred yard hike down the north side of the mountain and back. The Rausch Gap shelter is only a couple years old and has a neat layout as well. It has a spring right there, and a creek close by if the spring is dry. Either one of these places has easy routes in/ out and neat scenery nearby.
Amazon has the ATC 5 map PA set if you wanna check out where they are relative to trailheads etc. You'll need the maps anyway when you go. Both places can be reached easily in short weekend hikes that aren't the rockiest parts of the AT, IMHO.
Planning it also depends if you'll have 2 cars or wanna loop back but there are lots of possibilities for neat AT hikes.
Another one I've never done but sounds really neat is Laurel Highlands trail out near Pittsburgh. Google that for more info. It's a loop I believe.