We took my son who was almost 6 and my daughter who was almost 9, they absolutely loved it, as did we!
i was a little concerned about the walking and whether my son would cope. He was fine, they are kept so occupied with the sights & sounds that they don’t realise how much they are walking. Especially if you make sure you stop now and again for a drink etc to break things up.
We did around 20,000 steps most days. But this was broken up with attractions throughout the day.
We went to Empire State, Ellis Isand, Statue of Liberty, Night bus tour, Ellen’s star dust diner, Central Park, national history museum & the art museum (forgotten the name!)
Some of the museums have free entry on certain days/times worth investigating
I would highly recommend it! We were so glad we did it when we did as Covid kicked off the year after so no holidays for a long while.
I always feel with travel if you can do it, just go for it!
If you have questions pls do ask.