well, beaches in HK are not inferior to US's, they are just... different.
you can take the open-top, double-decker bus from Central to Victoria Peak;
after you are done, take the 'vertical' tram thing back down to Pacific Place.
walk around, have lunch in the food court if you will (to experience what 'crowded' means in HK).
Lan Kwai Fong is 15 minute walking distance from Pacific Place. If you don't wanna get lost, take the Tram towards Central area (westbound).
check out the famous Chui Wah restaurant in Lan Kwai Fong. Their fish soup noodle is great and open 24 hours.
For Dim Sum, i can't think of the best of the best. But the ones in Lee Theatre Center (14-18 floors are all Dim Sum restaurants) and Times Square (Floor 11-13) are very solid choices. Times Square and Lee Theatre Center are located in Causeway Bay.
and as mentioned, MongKok has a computer center building (you find some stuff cheaper in HK, but not by much). That building is located right next to the famous "Lady's Market." No, it's a not whore house; it's just a long narrow street with ppl selling a bunch of gizmo and gadgets, kinda like a swap meet.
also, another place you can visit and burn time is Tsim Sha Tsui, just another tourist area, so 1-2 hours will do. Walk along Nathan Road and take the ferry back to HK side.
mind you, the first thing you should do is visit the tailor because it will take some time for them to finish.
and PM you about the MPs