You could start out as a candy-striper - a volunteer, then a nurse's aide - CNA (Certified Nursing Assistant), then LPN, then RN, LPN - Licensed Practical Nurse.
Doctors could start out as interns, then go up the ladder until they are specialists, surgeons, administrators, etc.
I would love a maternity wing, ER, Physical Therapy area w/pool, different wards, operating rooms, recovery room, nurses station. There could even be a cafeteria. The peeps could earns awards and promotions, purchase medical equipment, collect flowers and books, magazines, and candy. Start off with a walk-in clinic, then a medical center, university hospital, and finally a major trauma center (no blood). The rooms could start out with just a bed and an end table, and you could purchase a phone, TV, curtains, recliner, etc. Nurses and doctors could purchase different style and colored uniforms. Patients could have different gowns to buy. And, they could buy different food to eat - each worth more or less depending on whether it was good to eat.
Great idea!