I just spent the whole day today in NYC, wandered around Chelsea, then to Union Square, and then ran down to Soho to do some errands and then home. It was amazing and a very quick trip from downtown JC. I used to live in Manhattan and it would take much longer to get to midtown/downtown from my apartment than it does from Jersey City, ironically. I would not do Weehawken, I think downtown JC is a much better place/vibe. Weehawken has THE most amazing views of NYC, but it is more of a sleepy suburb, in my opinion. In JC you can walk to everything, wander into shops and restaurants, and just truly enjoy city life, and then hop on the PATH to the city and be there in 10 minutes. I love both Paulus Hook and Hamilton Park for neighborhoods! Feel free to PM me if you want more info!