Take the cable car from Tung Chung up to the Buddha, visit The Peak, a ride on the Star Ferry (just to say you've done it!), dinner at the restaurant at the top of the Penninsula Hotel and watch the light show at 2000 (?). A visit to Stanley. I'm sure the regulars can add much more. Buy yourself an Octopus card and travel on the MTR (underground). Easiest way to get around, and most of all enjoy!