We visited so many sights, and the skip the line was the best part! made even better by our tour guide Jeff who knew so many people, which gave us that extra special treatment. Take it all in, and try and go with Jeff if you can he has so many stories and is very personal when explaining so much especially 911 sight.
We didn't get to open the bus which was unfortunate the bus driver was adamant about that and i thought that was a bit of a disappointment as it was a sunny day (1st in days!) and we paid the extra money for that exact reason - an open top. So that was my only complaint.