The restaurant by the golf course is now a Perkins.
The tracks through Tunkhannock are used by the Reading and Northern to serve PG's giant Mehoopany Plant and to interchange with the Lehigh Railway at Mehoopany. Reading Northern spends a few hours each day switching the PG plant and the associated yard tracks, but they really don't do all that much, they just work at a very safe pace. PG has very tight security so almost none of this work is visible to the general public.
CP Rail operates a few trains a day over the Tunkhannock Viaduct. I've seen a lot of construction debris loads heading north out of Scranton as well as intermodal and general merchandise traffic heading both north and south. Northbound intermodals are generally less fully loaded than the southbounds.
If you are considering visiting Scranton, the Radisson Lackawanna Station Hotel is a lovely place to stay, located in the old DL&W Station in downtown Scranton. They have an excellent brunch on Sunday's. Steamtown isn't really all that great, but is worth a trip if you've never been there. The trolley museum is also mediocre, but the ride on the old Laurel Line is something I do with my son as often as possible and is well worth the time.