Upper Waikani Falls (aka Three Bears Falls) is normally 3 separate waterfalls but for our visit it was just one big torrent; the water for many of our falls was exceptionally muddy as a result of all the rain
I've visited the 9/11 Memorial a couple of times so skipped it on this trip; One World Trade Center (ie Freedom Tower) is still jaw-dropping as the tallest building in the Western Hemisphere (the same architect designed Willis Tower and Burj Khalifa)