The Brickhouse Inn Bed and Breakfast would be your ideal accommodation for visiting Gettysburg's National Military Park. The park is open all day - from 6 a.m. to 7 p.m. now, and until 10 p.m. from April 1.
The Visitor Center (museum, movie and cyclorama) is open every day (except Thanksgiving Day, Christmas Day, and New Years Day. The Center is open from 8 a.m. to 5 p.m. now, and closes at 6 p.m. from April 1. Check out the Park events and Ranger Programs on the National Park Service website National Park Service, Gettysburg