Mong Kok is an experience in itself, the population density an acquired taste but fun too. And a short Metro trip away from Sai Kung and other new territories highlights like the HK wetlands park where there is practically no one. Lion’s Rock Peak is well worth your effort. Markets, malls and short distances to HK island sites especially the Quarry Bay park walk to Sai Wan Ho Ferry pier across the harbour at sunset to Sam Ka Tsuen Pier and walk the path past a plethora of seafood restaurants offering ginormous everythings you’ve never seen before. Foods and desserts abound in Mong Kok making dieting an afterthought. People are friendly but remember who has time to dilly-dally except the curious tourist. Savor the moments, stay for a month and appreciate good natured people.