If you are driving, there is a driving tour path set up. And at your own pace you could see quite a bit of the battlefield (stopping to get out and read all of the stone 'tablets' they have all over near each monument to explain the history of each area. Here is a resource for tourism that you might want to check out: link.

As far as dinning, one of the most historic places to consider might be the Dobbin House. Built in 1776, and was a part of the under ground railroad (Very Historic). Other than that, I think the Pub, and O'Rourkes are both ok. But they are not really anything too unique to the town. The Lincoln Diner (right off the square) is open 24 hours if you are in town late - pretty much everything else close early (and bars at 2am).

I was born in Gettysburg, but I moved away when I was 18, and so much has changed. A lot of my personal favorites have been close, sold, or torn down over the years. less