Sandemans, which operates walking tours in 18 cities worldwide, offers free NYC tours that show visitors the best of the City's historic downtown landmarks. The walks are led by certified tour guides who are passionate about the City, and conduct their tours on a tips-only basis, guaranteeing the highest quality. They’ll never pressure you to tip: Sandemans believes tips should be in direct proportion to the quality of the tour and the budget of the individual traveler. Tours begin at the National Museum of the American Indian at Bowling Green every day at 11am and 2pm.