Me and my family will be visiting the US this summer. Gettysburg is on the list, so are Hampton Roads, Manassas and possibly Fredericksburg. Are all these solid choices for a day out? We'll also be spending a few days in the Shenandoah Valley, are there any recommended CW related sites in that area?
When you are able to visit the U.S. and if the National Parks are open, I hope you are able to visit all of the sites on your list. I've been to Gettysburg many times, and Antietam and Manassas each a couple of times as well. They are further apart from each other than a map suggests and you can easily lose several hours just driving from one battlefield to the next.
Gettysburg requires at least a full day to experience properly. The park's interpretive center is huge -- much larger than the one at Antietam in 2014 and what I remember at Manassas in 1999. The battlefield at Gettysburg is mostly complete and, while expansive, is easier in my opinion to comprehend 'boots on the ground' than Antietam or Manassas. Most importantly, much of Gettysburg's local economy caters to battlefield tourism so the town is rich with licensed guides, souvenir shops, private museums, antique dealers, reenactment suppliers, ghost hunting tours, etc.
Here is my recommendation for touring Gettysburg: Begin on the Chambersburg Pike at the McPherson Farm where Lee's army first clashed with Buford's cavalry and the first day's fighting unfolded. Visit the Lutheran Seminary's museum on Seminary Ridge -- it is worth the admission. Anticipate 2-3 hours in this area. From here the Federal army retreated through the streets of Gettysburg and consolidated on Cemetery Hill, so drive through town and work your way over to the Military Park's interpretive center. Anticipate 2 hours at interpretive center. You can easily spend all day on the battlefield itself, especially if you walk it. If you drive the auto tour, I recommend first going the Round Tops area (1 hour) and then Culp's Hill (1 hour) to cover Day 2's fighting. From there you can detour to Confederate Avenue to review General Longstreet's positions, then visit the Wheat Field and Peach Orchard battle areas on Emmittsburg Road; or go directly to the Bryan Farm area for the Federal positions during Pickett's Charge. That's a full day of activities; I recommend staying overnight in Gettysburg and pacing your visit.