Just an FYI, the "couple blocks" to the PATH station is at least a half mile. I have bad feet, so that walk back from the PATH station after a day on my feet in the city was brutal.
That being said, you cannot find a more convenient park to the city. The PATH train is super convenient and takes you into the Subway in lower Manhattan. Their is also a ferry that leaves from the park, but I never took it. It ain't pretty, it ain't cheap, but its the best option for easy access to the city. Enjoy your trip!!!