You must go to 流浮山的下白泥 to see the sunset, reli cool and fantistic when the weather is good. It's quite romantic. Afterwards, should be followed by a candle light dinner with a anniversary present for her !!
Or stay over nite in Macau...outlying islands... Hong Kong Gold Coast is also a good choice but a bit expensive.
Depends on where you want to go, you want to go inside hk or leave hk? if you want to play inside hk, I have some experence for your reference!
Just e-mail me if you need it! [email protected]