To compensate the hard physical work there are sports facilities such as fitness rooms, pool billiard, or on larger facilities even a swimming pool. Some are fitted with a cinema, or shopping mall. Also you will find necessities as a medical station, doctors or a postal office.
Offshore (oil rig) installations operate 24 hours a day, so depending on your job you may have to do night shift. With some jobs you may have to do a combination of days and nights. There are different systems used usually dependent on helicopter arrival times and company policies. Often you will start your "trip" on day shift and then move to night shift on your final days before going home. For example if you do two weeks on: two weeks off, you may do a week of days and a week of nights.
Off shift facilities vary from rig to rig. In the past there may only have been a packet of cards and a couple of dog-eared novels as rig leisure equipment. Today most rigs have excellent gym and sauna equipment. It is a great feeling to step off a rig with two or three weeks off. Some people travel half way round the world to their work.