Step inside the new children's hospital in San Francisco and it might feel more like you are at the Exploratorium. That is exactly what officials at the UC San Francisco Benioff Children's Hospital San Francisco want patients to experience with its light-shadow installation and rotating art exhibits in the lobby. The facility is The City's first stand-alone children's hospital, and it is one of three new UCSF hospitals that will open Sunday as part of a $1.5 billion medical center at Mission Bay. "In a children's hospital, you put in a lot of things for fun, but that's part of the health care treatment," said Kim Scurr, executive director of UCSF Benioff Children's Hospital San Francisco.