Hong Kong is not the kind of city you visit without an agenda. Even if that agenda is as simple as sightseeing and shopping, you need a reference point to navigate the bustling city streets and crowded alleys. Fortunately, Hong Kong’s metro (MRT) is one of the best and cheapest in the world. Just purchase an Octopus card for multi-rides and map out your destination before you get packed like sardines into a subway car in this cosmopolitan city of 7 million.