Get your folks to buy you a Wii. That keeps my nephew and niece busy for hours on end.
Volunteer and help people less fortunate than yourselves.
*slap* *slap*
Sorry, what was I thinking... ?
I like to get lost myself.
Get on the bus or the MTR and go somewhere I haven't been before and wander until I have no idea where the hell I am (deliberately don't take a map). Spend the day out wherever I am, eat some of the local food, find where the markets are and wander round them... and then try and find your way back home.
I had a good time doing this in Shatin in late November.
Can learn dancing! Or even film and television production!
http://www.hkapa.edu/asp/general/gen...g=eng&mode=gui
Or go painting with friends! I've never been there but will go soon.
http://www.artjamming.com/
Read books. At libraries.
Go to an organic farm to... farm...
http://www.hkgardenfarm.org/