The school field trip, once a supporting player in a well-rounded education, is slowly becoming endangered. Widespread budget cuts have made happily anticipated class trips to museums, zoos, and other cultural destinations increasingly scarce. A librarian may be able to rescue the field trip from extinction by transforming the school building into a field trip destination in its own right. Imagine temporarily turning libraries into planetariums, gyms into art galleries, and school yards into zoos, and one begins to get some idea as to why the William Floyd School District in Mastic Beach, Long Island (New York) invented Museum Day. With a dose of ingenuity, careful planning, and support from local cultural organizations, a school can also become a museum multiplex for a day. This article lists 10 steps to museum day success.