HKGs national sport is shopping. It opens late and closes late so be ready for an altered schedule.
Re children: Ocean Park is fun as is Disneyland.
Our last two trips have been 1 week in Kowloon and 3 nights at the Disneyland Hotel.
In general search the threads here but go to Tim Ho Wan for some real cheap Michelin Star dining. In Mong Kok it opens at 10am but get there at 9 and queue.