Obviously you could eat at Ruby Tuesday's or Friendly's. But you can find them anywhere. If you are in the Lebanon PA area (east of Harrisburg and Hershey, north of Lancaster, west of Reading) there are a few places that I would recommend.
Ye Olde Bake Oven in Myerstown. Great Pennsylvania Dutch food in a local eatery and low prices.
Fresh Donuts on the east side of Lebanon. Great donuts made that day. If you like donuts, go here. Very cheap, too.
Kugos on the south side of Lebanon, in the Kmart strip mall. You would not expect to find a high class Japanese restaurant in a strip mall in Lebanon. But here it is. Beautifully decorated with hibachi and sushi and reasonably priced.
Blue Bird Inn south of Lebanon. This pub has great American food that can be enjoyed in either a pub or dining room setting.
Patsy Fagan's downtown Lebanon. An Irish pub with great Irish food like bangers and mash, fish and chips, or shepherds pie along with several Irish beers on tap. In the middle of PA Dutch country.
Batdorf in Annville. American and Southwestern fare with a dining room and a bar.
Big Daddy's on the east side of Lebanon. Ribs and wings.
A&M Pizza. Every place seems to have their own little pizzaria and thinks it is the best. We have A&M and have about half a dozen spread throughout the county.