For leashed walks, check out the three miles fairly gentle (yet challenging in places) trails at Westwood Hills Park just a mile off Highway 29 in the southern Napa Valley. It’s a half-mile climb through a fragrant eucalyptus forest to a great viewpoint at the top—and if you don’t feel like climbing, you can stretch your legs on flatter sections of trail at the base. Easier still: take a stroll along the downtown River Walk or check out the trails in Trancas Crossing Park, a 33-acre preserve where you can enjoy nature and even launch a kayak.
To really escape the tourist crowds, try the serene, four-mile perimeter hike around Lake Hennessey, Napa’s municipal water-supply reservoir and a popular fishing and birding destination. If you’re feeling really ambitious, block out a day for the challenging, 8.3-mile Oat Hill Mine Trail in Calistoga, which provides sweeping views of the valley and up-close looks at striking volcanic formations.
A bit farther afield, Lake Berryessa beckons with the easy 2.6-mile Smittle Creek Trail from Smittle Creek Park to Coyote Knolls in Oak Shores Park. This well-maintained path follows a shoreline route alongside a quiet strait popular for canoeing and kayaking. Also, at Berryessa, the Pope Canyon Trail provides lake access after a 1.5-mile hike in from the trailhead.