Arrive early-ish to the start, that was the basis of my only hesitations of doing it again, we had trouble finding the rental outfit we had arranged for a bike m wife wanted to use. Ride with amazement and awe through streets of a city you'd never seen like this before and respect the limitations of being amongst so many other cyclists (no sudden stops or turns). Riders will begin to be stretched out by the time you're out of Manhattan. There are multiple facets of this ride to appreciate besides the strictly cycling part. Have those on you day's bucket list and you'll be hooked. I'm good riding very slowly, I think that's a Rivendell handling check box and it was useful in the beginning.
As Dave points out, Drive to and park in Staten island at the terminal lots and take the ferry over to Battery Park first thing in the morning and be ready to queue up at the start area. We stayed in Newark the night before, just made things easier with included on-site included parking and restaurants. An easy trip to the ferry terminal in the morning, a very simple exit for our departure (I had a longer drive that you will). the convenience of proximity to the start of this event is only the sweet song of Lorelei and those staying in town longer.
I reported previously that during the ride my orange Rambouillet was called out repeatedly. I was told how well it fit me and how nice it was that my wife (and many proximate riders of much more expensive "modern" bikes) seemed irked by the repetitive attention. "Are these the people you email on those bike lists?" my wife asked. It was enlightening to see how many normal riders participated, very few displayed the "I'm going to crush this" attitude, or were bent on trying to set a fastest known time imprinting the fun event with their minority raciness.
Take advantage of every organized rest stop. We did not and as it became hotter and the route merged onto the Gowanus Parkway, an elevated limited access roadway, going south toward the Verrazano Narrows Bridge, my wife was out of water, snacks and bonked (too casual with event prep, "It's only 40 miles"). Plan to have some goodies and extra water in your bag as well as necessary weather preps be it sunscreen or rain gear and insulating layers. It's a day and things happen.