Time Out says
Heart of Brooklyn—an alliance made up of the Brooklyn Botanic Garden, the Brooklyn Children's Museum, the Brooklyn Museum, the Brooklyn Public Library, Prospect Park and the Prospect Park Zoo—celebrates its tenth year with gratis admission today. After a whirlwind tour of the borough's major cultural institutions, your crew can take a break with kid-friendly actvities like Brooklyn-themed mini-golf. Times and locations vary. All ages.