Other than rudeness, our "accents" (you know, the way we say caw-fee instead of coffee), miles and miles of urban highway (aka:the NJ Turnpike) and The Sopranos...NJ is known for something not many other states can boast about.
If you have ever had NY/NJ pizza, I am certain you can attest to its deliciousness and the fact that you can only get pizza that tastes this way in either NY or NJ.
Any relative who has moved to another state from Jersey always has to have pizza at least once when they come to visit.
It is literally nirvana.
Just see for yourself: