The Ten Thousand Buddhas Monastery or Man Fat Sze (萬佛寺) is one of the oldest tourist attractions in Hong Kong. Located in the new territories in Sha Tin it is a fantastic place to visit and take a picture. Being in Sha Tin though it is quite a long way out and probably not worth visit on its own unless you also have an interest in one of the nearby attractions such as the race course, the bee farm or the Hong Kong Heritage Museum.
Macau is the closest destination to Hong Kong and a great place for a day trip or a weekend break away from HK. An ex-Portuguese colony it has a similar status as a special administration region of China as does Hong Kong, but with a distinct cultural and historical heritage that makes it a different experience for the visitor.
Itinerary are by themes and districts at the moment but I’ll try to estimate on the time spent for those who have limited time to stay. Most districts mentioned here are easily accessed by public transport.