[alt-photo] Travelling to NY

[Bruce]

Hi All
I am travelling to New York for the first time between April 18 and 26th. Does anyone one know of any "must see" things related to Alt photo. I am planning to go to the main galleries(Moma,Guggenheim,Frick), but is there smaller galleries I should see? Is there any alt photo exhibits on during that time that people would recommend? We have a limited time so any suggestions from New Yorkers would be appreciated.
Thanks
Cheers
Bruce