article_snippet.sent: San Francisco International Airport offers travellers a free two-hour city tour, which includes the famous Fountain of Wealth .
article_snippet.sent: If you are in Singapore and have at least five hours to spare before your connecting flight, you can register for a free two hour sightseeing tour of Singapore.
article_snippet.sent: a free two hour sightseeing tour of the city has a short stopover at the Merlion Park for panoramic views and takes in the Colonial District, Central Business District and Chinatown or Little India.