In this photo taken March 25, 2013 shows a view from Mt. St. Helena along a hiking trail in Robert Louis Stevenson State Park near Calistoga, Calif. The hike is one of several free activities visitors to the Napa Valley can enjoy. (AP Photo/Michelle Locke)

Associated Press
In this photo taken March 25, 2013 shows a view from Mt. St. Helena along a hiking trail in Robert Louis Stevenson State Park near Calistoga, Calif. The hike is one of several free activities visitors to the Napa Valley can enjoy. (AP Photo/Michelle Locke)
In this photo taken March 25, 2013 shows a view from Mt. St. Helena along a hiking trail in Robert Louis Stevenson State Park near Calistoga, Calif. The hike is one of several free activities visitors to the Napa Valley can enjoy. (AP Photo/Michelle Locke)
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