I saw the Issac Mizrahi show at the Jewish Museum on Saturday (free admission all day) and it was divine. I'm a huge admirer.
There was also a fascinating exhibit of the work of Roberto Burle Marx and an installation on the ground floor by Beatriz Milhazes which made the museum a great destination.
(And then we saw the film "Maggie's Plan". Highly recommend. A cute twist on a woman who finds herself having a child on her own.)