For those unfamiliar with both: Brave New World features islands which are limited domains in which free-thinking is both permitted and encouraged, as Mustapha

For those unfamiliar with both: Brave New World features islands which are limited domains in which free-thinking is both permitted and encouraged, as Mustapha Mond explains to Bernard and Helmholtz late in the novel. In part these serve as centres of creativity which the World State needs. Island is a paradise world which largely stands, as you note, as a counterpart to BNW. Though all does not go well. Here and now boys! Here and now ...