The Art Factory will run a trolly between the parking lot, the reception and the Great Falls, which is right up the road . It's definitely a cool spot to check out and is a nice spot to take photos. It's also walkable (probably ~5 mins from the Art Factory), if you're trying to get your steps in.
Right when you walk into the Art Factory there is the recently opened, Chelsea Market-esque Mercado. Here there are a series of pop up shops and artist's displays. Allegedly, there is also a cafe to get snacks and coffee if you want to pre-game all of the food you will be given at our wedding :P. Definitely worth taking a lap around to check it out before you take the freight elevator up to the International Gallery!
If you're coming from out of town and have some extra time, definitely check out NYC! It's about 30-60 mins away by car, depending on traffic.
If you're making the journey into the city, ROKC is one of our all time favorite restaurants. Great ramen, great oysters, and SUPER great cocktails. If you go, either go right when they open (maybe even 15 mins before they open) or be prepared to put your name down and wait 60-90 mins for a table (you can go get a drink somewhere else as you wait, it's definitely worth waiting for!)