The triple combo tour with Alex of Highline, Greenwich and Historic Downtown was fantastic. We were a congenial group of 5 (their max is something like 8). Our guide was very knowledgeable, attentive and super easy to talk to. We got good facts on everything from architecture to politics, but also really interesting stories. We walked the Highline and got some great views of the city. In Greenwich, we stopped at several really unique, high quality, local eateries--come hungry, the food was very plentiful. The historic downtown was fascinating. Wear comfortable shoes, as we probably walked 4-5 miles over the course of our several hour tour. Internet site is well done and easy to navigate. You get an email reminder a few days before your tour. A super value and tons of fun. This would be a great thing to do on a first day in the city, as it gives a good background and perspective for the rest of the trip.