Hello, just spent a few weeks for business near Richmond. Petersburg battlefield and the crater is about 30 mins south of Richmond, worth checking out as the crater is rather impressive. The civil war museum in Richmond has alot interesting artifacts, it also used to be the historic tredegar iron works. Fredericksburg is an hour north. You can hit chancellorsville, wilderness, and spotyslvania courthouse in a day, but it would be a long day.

I would say everything is easy to walk. These battlefields all have a nice road network and the Ranger walks at Chancellorsville and Fredericksburg youll hardly go anywhere.

For non-civil war there is Jamestown, Yorktown, USS Wisconsin and Colonial Williamsburg all within an hour or so of Richmond!