Not sure in PA where you are from, so you may already have had enough of it, but some of the most beautiful biking territory is in central PA around the State College area. It's Amish country with wide rolling valleys and many small, low traffic country roads. There's an old book called 25 bicycle tours in Eastern Pennsylvania, that has a lot of really nice 25 - 60 mile loops in it. It's out of print, but still available on Amazon. And even if you don't want to go on vacation in PA - even from the ends of the state this stuff is still accesible for weekends.