The Edge is located at 30 Hudson Yards with major tenants TimeWarner, KKR, Facebook and Wells Fargo; the building is at the northernmost end of the High Line, a 1.5 mile long elevated park that has become one of the city's biggest attractions
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)
We snorkeled at several beaches but there wasn't much to see, especially compared with Maui which had better visibility and more underwater life; Tunnels Beach was the best of the ones we visited