It is fairly easy to get to the Apple HQs. Just take Hwy 101 to the Hwy 280 junction. Travel south until you reach De Anza Blvd. exit. The buildings on the south-west side of 280 are Apple's six main HQ buildings. If you're looking to tour the Apple campus, then you had better be prepared to admire architecture.
Security is, as one has come to expect from a leading product developer, rather tight.
Each building has a distinct colour and number indicator. The buildings make a rectangular park a central part of the campus. The campus is clean and seems very well maintained. No manufacturing seems to take place here. One place that is open to the public is the Apple Store.