The Garden Conservancy hosts annual garden tours throughout the US, including here in Silicon Valley. Tomorrow there will be a (self-guided) tour in Saratoga, Los Gatos and Monte Sereno featuring the beautiful landscaping of four homes plus an Italianate Garden at Villa Montalvo, also in Saratoga.
Tickets cost $5 per garden per person (kids under 12 are free). Or, become a member of the Garden Conservancy and enjoy discounted ticket prices. They also offer a directory, which can be purchased, of all the tours nationwide. Great idea fodder!