Make sure you wear comfortable shoes. You're only covering about a half mile between start to finish, but you're walking for the majority of the day. We logged about 10,000 steps between walking to the subway, to the meeting place (including a little walk around Chinatown because we were early), through the tour, and back to the subway. You'll be outside for the majority of the tour, so you want to dress for the day. Wear a jacket if it's cold, bring an umbrella is there's a chance of rain, etc. Tours are rain or shine, and this includes if it's snowing. So keep that in mind if you book a winter tour.