SINGAPORE - The only way to truly appreciate a city is to walk its streets, stroll through its parks and meander along its riverbanks. Which is hard to do in cities that are spread out over vast areas — Los Angeles, Tokyo and Beijing, for example. To make our 10 Best Walking list, cities had to offer our readers a horde of tourist sites, restaurants, museums and nightlife in concentrated areas – in easy walking distance, without taking a cab ride from site to site.