For everyone who's spending their summers and/or the rest of their lives in New York City (myself included!),I just found this great Guide to NYC intended particularly for students and interns:
http://www.findingdulcinea.com/guides/Careers/New-York-for-Students-and-...
I think it can definitely come in handy for NY newbies or even for those who already know the city... there's always something new to discover about NY, right?
Also, the website findingDulcinea.com is a great resource to have... they publish Web Guides for basically everything in a very concise and user-friendly fashion... You should definitely check it out!