If you are at the Newark Liberty International Airport you are actually in the middle of Newark and Elizabeth, New Jersey. The Marriott Hotel is inside the airport complex and this luxurious hotel provides comfortable accommodations. If you want to visit the city from the Newark Liberty International Airport then picking up a good car rental service would be your best bet and gives you the flexibility of visiting attractions on your own schedule.
There are plenty of things to get involved in once you are in Newark. There are many parks in the townand are very relaxing. If you go downtown, Newark then you will see the The New Jersey Historical Society there and you can learn about the history of New Jersey and discover works of art. If you are into theater, then check out the New Jersey Performing Arts Center. A popular place around here is the Prudential Center which has lots of great concerts and shows.
There are many great places in Newark. So, take your time and enjoy your stay in Newark.