Nearby MongKok(Wikipedia) is the happening place in Hong Kong! All your needs in leisure, food and shopping are all in this little area. However, depending on the time of the attempt, the difficulty rating will vary. You will surely find rambling muggles, hordes of them watching you. Be warned.
The area has only one legitimate entrance and opens from 0700-2300hrs daily. You may also get to experience an "odour" treat if the wind direction is apt. But no smoking please.
The stereogram image will help in locating the cache.