You will probably get to Gettysburg by car. The good news is that it's less than a two-hour drive from Philadelphia, Washington or Baltimore, which has the closest airport (BWI).
Civil War buffs have been making reservations for the 150th anniversary of the battle (July 1-3) for years. If you don't already have a room booked nearby, plan a day trip, and start early to beat the traffic and find a place to park. It's a small town with limited public parking.
Your best bet is to travel well after the anniversary. Spring, when I went, and fall are particularly nice times to visit. No matter what time of year, to experience the true serenity of the battlefield park, go in the early morning or evening. The big tour buses — often filled with schoolkids — seem to arrive between late morning and early afternoon.
There are basically three options for seeing the battlefield, the least desirable being one of the aforementioned bus tours. Second best, but a bit pricier, is a guided auto tour with a military expert who will take the wheel of your car and talk you through the complex movements of the Union and Confederate forces over the three days of the 1863 battle (details below). If you don't want to spend the money, you can self-guide the 24-mile auto circuit, relying on maps and markers provided by the National Park Service.
The best option, if you have the stamina, is to walk the battlefield like the soldiers once did. A number of marked paths cover the 6,000-acre grounds, one of the best being the 1.5-mile Cemetery Ridge trail beginning at the National Park Service Museum and Visitor Center.
The newly refurbished visitor center is also a good place to get oriented, with a museum, bookstore and a theater that shows the must-see "A New Birth of Freedom," narrated by Morgan Freeman. Also not to be missed is the giant Cyclorama (360 degrees) painting by Paul Philippoteaux of Pickett's Charge. (There is an entry fee; see below.)
National Park details
For more traveler information on Gerrysburg National Military Park, go to www.nps.gov/gett.
Admission to the Gettysburg Museum Experience, the film "A New Birth of Freedom" and the Gettysburg Cyclorama program ranges from $12.50 for adults to $8.50 for ages 6-12 (ages 5 and under admitted free). You can buy tickets online at www.gettysburgfoundation.org.