Mongkok was once one of the most densely populated areas in the world. If you hit Soi Yeung Choi St at night you`ll understand why. Mongkok is known as the home of Hong Kong`s triad gangs and is also the location of the popular "Ladies Market" on Soy Street.
To get to Mongkok, catch the MTR (or KCR East Rail from TST) and alight at Mongkok station. You can also catch a bus from Nathan Road in TST.