Fair warning to all of Virginia?s couch potatoes: Curtis Badger has compiled such an engaging and refreshingly unconventional treasury of outdoor adventures that you may be compelled to give up your seat. He will send you in pursuit of rare salamanders on the slopes of Mount Rogers, to dig clams on tidal flats along the coast, and to spot eagles along the bluffs of the Potomac River. Dividing Virginia into four regions?the Eastern Shore; the Tidewater,...