Possible Clues:

• Sonoma County winery
• Valley where the Ronald Reagan Presidential Library is located
• Go ___
• __ Valley (neighbor of Thousand Oaks)
• California's __ Valley: Reagan Library site
• California's Valley
• Weapon from pessimist, whichever way you look at it
• Valley northwest of Los Angeles
• __ Valley: Reagan Library locale
• -- Valley, California