What should I do in nyc? What are the best museums or art galleries? Best cafe ?
Discussion
Go check out the museum of natural history. I especially enjoy looking at the plastic dinosaurs on exhibit.
Leave. It's a terrible place. Always has been, always will be.
A less asinine answer to your questions:
The main branch of the NYPL (NY public library) is pretty amazing. Central Park in the fall is rather lovely. Chinatown and little Italy have some of the best food in the city.