May I ask- are you Asian or Caucasian? If you are Caucasian, you might not appreciate some of the other things available, like concerts by Asians. For example, a popular (well used to be popular, depending on who u ask) Japanese singer called Ayumi is performing this weekend. There are many concerts held by HK and other Asian celebrities throughout the year. There are also HK comedians.
Obviously you'll miss out on these if you arent really fluent in some Asian language, or not interested in Asian entertainment scene, in which case it's not that HK doesnt have anything to do, it's that you arent able to participate in the things on offer.
Also it depends on you as a person. From my window, I can see people swimming, and also wakeboarding. There are many sports halls where you can play sports, like tennis or badminton. Restaurants abound.
Look, I'm not telling you anything you dont know. But if anyone's interests are limited, for any reason, then it doesnt matter if it's HK, Tokyo, or Geneva. After a few years i reckon people'll end up with the same 'ol same 'ol kinda feeling.