The Morrison Hill Park (school) skatepark is really good fun. It is in few videos. If you go to Wan Chai station it is about a 5/10 minute walk. It is near a school (called Morrison Hill school, I think).
There is also a place called Mei Foo skatepark, in Mei Foo. Looks ok from pictures.
There is also an indoor place run by 852 skateshop and Vans I think. Not sure where it is but the shop is in Causeway Bay.
Finally, there is a place up in the New Territories that looks amazing. Forget the name but it's a big concrete park.
Can't help you on the Rolex though...