ok, I'm sure everyone else will have your basic tourist package covered. For those who have been here already and done that, here's my list of things you should check out in your 2nd/3rd or well, any other time.
-Shake Shack – Bar none the best hamburger (imo) in the city in a nice atmospheric park. There will be lines, but it's all part of the experience. I recommend the Double Shack Burger, you won't be dissapointed. I hear their Mushroom burger is amazing as well, but I can't ever get myself to stray from the regular.
http://www.shakeshacknyc.com/
-B&H Photo Video
Do you like photography? Do you like photography A LOT? This is your mecca. Not only is it huge and has everything, the way the store is setup is pretty interesting. Go here and watch the hacids and their crazy gadgetron store wizzardry in motion.
-The Czech Beer garden in Astoria, Queens is pretty amazing. Giant yard with picnic tables, awesome Czech beer, and dudes roasting weenies and other tasty meats. Go here, and you will have a real NY experience.
http://nymag.com/listings/bar/bohemi...d_beer_garden/
-Take in a show at Jazz at Lincoln Center (jazz greats live Wynton Marseilles live here)
http://www.jalc.org/
-or go to BAM if you are in theatre/dance etc. It's good for the ladies.
http://www.bam.org/
-http://www.ps1.org/
A great contemporary art museum that most tourists pass up because it's across the river in Queens. It's a great museum converted from an old school.
-Fette Sau
A great little BBQ place in Williamsburg. Again, this is a authentic young NYer experience. It's across the river in Brooklyn, but the entire area is a great place to be if you don't mind being surrounded by people who are into hip things (there should be some sort of word to describe those people).
-Brooklyn Museum - Some of the best art I have seen has travelled through this museum. Almost everytime I am there I am wowed by the work. If you've done the Met, go here. It's smaller, quicker, and often times, more interesting.
www.brooklynmuseum.org
-Grimaldi's Pizza:
Not really a secret by any means, but this really is the best pizza in NY at the moment. It's under the Brooklyn Bridge on the Brooklyn side. Get there early, there will be lines.
-Apart from Curry Hill in, well, Murray Hill, there are some great indian restaurant on 6th st between 1st and 2nd. London is known for their great Indian food, but NY is not far behind.
-Pylos Greek restaurant in the East Village is bar none the best greek food I have ever had.
-if you're in the East Village on St. Marks, and you see a big hot dog on a door...thats Criff Dogs. Go in and have one of the better hot dogs out there. Don't even think about having a street dog, go here. It's just as cheap and tons better.
-And finally, if you want a really amazing day trip out of NY, go to Beacon. It is an hour train ride up the beautiful Hudson river, and you will get to enjoy an amazing museum (DIA Beacon) which has some extremely interesting artworks by hotshots like Richard Serra