Hotel
Entrance to the hotel is at the North side of the building (Exchange Place). The ceremony and the reception are will be held on the rooftop. If you are not staying at the hotel, access to the event will be by elevator located on the South side of the building (York Street).
Train
Exit the station and go South, to Hyatt House Jersey City. Entrance for the hotel is on the North side (Exchange Place). Entrance to the wedding is at the elevator on the South side (York Street.) If you are at the Hyatt that looks like a boat, you are at the wrong Hyatt.
Discount Code - Hop the turnstile
Train
You're practically there, go to the North side of the building for the Hotel, go to the South side of the building for the wedding.
Discount Code - They never check for tickets
Flight
I have no idea how long it takes to grab the AirTrain to NJT to the path. I suggest Uber or Lift.
Discount Code - "Is an explosive belt considered a carry-on?"
Hotel
The other Hyatt. Looks like a boat, is on the Hudson River, but is not a boat.
Hotel
North of the venue. Follow the train tracks south. Maybe you'll meet up with your friends and go in search for a dead body that somebody's older brother told you about. Maybe you'll form a strong, long lasting bond with these people. Maybe Stephen King will write about it.