In this photo taken March 25, 2013, is a monument in Robert Louis Stevenson State Park marking the area where the famous Scottish writer, author of "Treasure Island," spent his 1880 honeymoon in Calistoga, Calif. Hiking the trail past the monument and up Mt. St. Helena is one of several activities Napa Valley visitors can enjoy for free. (AP Photo/Michelle Locke)

Associated Press
In this photo taken March 25, 2013, is a monument in Robert Louis Stevenson State Park marking the area where the famous Scottish writer, author of "Treasure Island," spent his 1880 honeymoon in Calistoga, Calif. Hiking the trail past the monument and up Mt. St. Helena is one of several activities Napa Valley visitors can enjoy for free. (AP Photo/Michelle Locke)
In this photo taken March 25, 2013, is a monument in Robert Louis Stevenson State Park marking the area where the famous Scottish writer, author of "Treasure Island," spent his 1880 honeymoon in Calistoga, Calif. Hiking the trail past the monument and up Mt. St. Helena is one of several activities Napa Valley visitors can enjoy for free. (AP Photo/Michelle Locke)
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