We tried to book scuba and snorkeling trips to Molokini and Lanai but everything was booked solid for the next 2 months; rental cars and hotels/condos sold out with international travel for Americans still largely banned
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)