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
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)