My wife and I did this walking tour on our first full day in New York. It turned out to be a great way to get the lay of the land before we signed up for any other tours and attractions. The tour included walking, a couple of Metro rides, and a cruise on the Staten Island ferry which gave us good views of the Statue of Liberty as well as of the south end of Manhattan. Even though the tour was for the whole day, the pace was relaxed and not at all strenuous.
Our tour guide, Justina, was very personable, knowledgeable, and excellent in every way. She provided interesting background to the many sites we visited without being overwhelming. This tour turned out to be an excellent way for us to start our visit to New York.