If you're feeling brave, you can always drive from Newark to Manhattan. Just be prepared for some crazy traffic and steep parking fees. It's not the most _relaxing way to travel, but hey, it's an option!
How to get to Manhattan from Newark Airport? NYC.eu
Parking in Manhattan can be a real challenge, but there are some parking garages and lots that offer somewhat reasonable rates. Just be prepared to circle the block a few times to find a spot, and don't even get me started on parking tickets! It's all part of the Manhattan experience, right?