Personal highlights

1. Google: after the headquarter, now I could visit the San Francisco office
2. Breakfast: getting something fresh and juicy to eat from an endless buffet
3. Tour guide: private tour through the offices and some other special rooms
4. Interior: not as fancy as expected, but with lots of small details and variety
5. Free food: multiple small coffee shops with fresh fruit on every floor

Image sources

1. Google SF wall-art
2. treadmills in the gym
3. arcade game room
4. fresh healthy food
5. hidden poker table