Depends on the department or group you work with. The general office environment is loud. There are no offices and depending on the building you work in, even some of the cubes don't have walls that dampen sound.
Mostly business casual. no jeans. some happy hours from time to time. As of late the moral in the company is stressed and low. There is a significant amount of bureaucracy and the company management style is foreign, European.
Typical day varies depending on the department you work in. Some are better than others, but take heed there are many people currently planning to leave, or who have left in the recent several months.