Tips for NY

I registered for the conference, I booked my ticket, found a place to stay and now I am getting really excited about my trip to New York March 28 to April 8. If you have ever been to New York I could use some firsthand tips on what to see and where (not) to go, what to try while I am there etc.
If you answer that it depends on my interests, I can tell you that my main interests for this trip are: arts of all kinds, photography, meeting people and salsa dancing. Any good ideas? :)

Illustration courtesy: olucas.wordpress.com