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)
The Cooper-Frost-Austin House, built in 1681, is the oldest house in Cambridge; the city of 116,000, home to Harvard and MIT, has 57% of its residents possessing at least a bachelor's degree
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
The yellow tang is common in Hawaii and is a popular aquarium fish; up to 70% of yellow tangs for aquariums were sourced from Hawaii until a 2021 export ban took effect