If you go up there, eat dinner at the Farnsworth House. They serve meals that consist of foods popular during the Civil War era. It's a bit pricey compared to some, but worth every penny.
I got to go up there during a Civil War tour for a class I took senior year of high school back in 1993. We started here in Chattanooga and made our way up through Virginia and the Southern states, and Gettysburg was the northernmost stop on the trip. I may not remember every aspect of the trip, but it was one of the highlights of my high school experience.