Guiding a city tour is like leading a flying V of geese: you have to be able to lead the group, recognize landmarks, and barrel backward through flocks of pigeons at high speeds. Get a flightless birds-eye view of the city with today's Groupon: for $7, you get a two-hour walking tour of the city from NYC GoGreen Tours (a $15 value). Today's deal is valid for the Central Park, Gangs of New York, New York Icons and History, or Nolita and Pop Culture walking tours.

NYC GoGreen Tours offers eco-friendly alternatives for taking in the sights and sounds of the Big Apple's quintessential cityscapes. The Iconic Tour trots along the shadows of such stately monuments as the New York Public Library, Macy's, and the Chelsea Hotel, while Pop Culture sightseers alight upon noteworthy artist abodes, eye-fetching television locales, and heartfelt memorials for the world's unknown sitcom extras. Little Italy's rich history rolls off the trilling tongue of the Nolita Tour's top-notch guides, who can also expound upon Old New York's architectural triumphs and the brutal brawls of the Five Points area during the Gangs of New York walkabout. Check the website for each tour's date, time, favorite color, and point of departure.