San Jose

San Jose needs 1 day: touring The Tech Interactive, an interactive technology museum in the heart of Silicon Valley, and visiting the Winchester Mystery House, the 160-room Victorian mansion built without a blueprint by the widow of the Winchester rifle manufacturer, the same afternoon. April-October brings the Bay Area's mildest weather. It's expensive, with the highest cost of living in the US due to the surrounding tech industry. It's the most populous city in Silicon Valley and home to giants like Adobe, PayPal and Cisco, though its tourist profile is smaller than San Francisco's despite having nearly double its population.