I was driving around Lemoyne the other day, and I noticed that PennDot has put up signs for a new BikePA bicycling route.
So, I turned on the GPS and followed the signs to see where they went. The route goes almost the whole way to Gettysburg, connecting Route J with Route S.
PennDot hasn’t updated their maps in ages, but OpenCycleMap always delivers the goods.
Once you get out of Mechanicsburg, it’s a very scenic ride. It runs for about 30 miles through farms and apple orchards. There are a couple of enormous hills, so be sure to wear comfy shoes for pushing your bike uphill.
Here’s a GPX file of the route, in case you’d like to put it in your GPS or mapping software.