The permanent piece called "Meeting" at MoMA PS1 is an etherial experience of light and color and quiet. Sit and look through the cutout in the ceiling and watch the light change both outside and in. You can't tell what you're looking at until maybe a bird flies by.
I love enjoying some Amazing Vietnamese food at this place before heading out to the different bars around Jefferson on L. The restaurant is just behind Elsewhere so you have a nice mix of things to do if you start your night here.