Elysburg, PA, is home to Knoebels, the world's largest free-admission amusement park, and its rides are top-shelf. It near Centralia, the town with a mine fire burning underneath it, which is worth a look just for how strange it is (steam billowing from the ground, houses with multiple chimneys, a sad and deserted bench in the center of town that says "We love Centralia"). Williamsport, home of the Little League World Series, isn't too far away. And while Scranton would fall under the "urban" umbrella, I'd give a shout out to the Lackawanna Coal Mine tour, which was fun and educational. Scranton's also home to the Houdini museum, which is on my agenda this summer. There's another coal mine tour, Pioneer Coal Mine and Steam Train Ride, in Ashland.
http://www.knoebels.com
http://www.centraliapa.com
www.vacationpa.com/Williamsport_To_Do
www.houdini.org
www.pioneertunnel.com