Playing by yourself is mainly expensive. McDonald's is the cheapest if you eat it. And there are many snack bars in the hutongs on the street. Generally, a bowl of beef brisket noodles is between 30 and 35 Hong Kong dollars. It's delicious. If you spend more money, you can go shopping. Buying famous brands is definitely much cheaper than mainland China (mainly world-famous LV, Kutcher or Shiseido cosmetics).