You can check the condition of individual roads with Google Maps street view. It will tell you the general condition of the roads, and whether or not there are paved shoulders. You can also find bike/multiuse trails with Google Maps; go to the desired area at close zoom, and click Directions and the bicycle icon. Green lines will appear on the map for paths open for cycling. And the roads that are recommended for cycling will have green dotted lines on them.
If your group has a lot of inexperienced riders, I'd make double sure to use low traffic volume roads. And get everyone to read the PA Bicycle Driver's Manual (http://www.dot.state.pa.us/Internet/Bureaus/pdBikePed.nsf/BikePedHomepage?openframeset&Frame=main&src=InfoBikeManual?readform), especially chapters 2-4.