I went to Gettysburg not too long ago, and just be warned - pretty much everything is closed by 6 PM. Except for Walmart and the chain restaurants. So if you want to see stuff around the town itself and not just the battlefield and museum, plan to get back to town around 2 to 3 so you have time to see some of the local stuff as well.

Appalachian Brewing Company has some amazing food and drinks.