The reason why I'm thinking of the Macau trip is merely the thrill of fucking her in some place other than her workplace which is getting abit stale.
You need a cover story. I suggest you arrange to go to Macau with friends that your SO knows for some sightseeing/gambling/golfing/partying. Then when you return alone to the Venetian hotel room or similar room you booked, you find that your fuck-buddy wg is already there waiting for you. (earlier you left her a room key with concierge)
You proceed to spend the night shagging her on the king size bed, jacuzzi, against the windows, etc...In the morning before checkout, you enjoy breakfast with her in the room. Afterwards you join your friends again for lunch before going back to HK. Your fuck-buddy goes on her own after you have had left room.
So much work just to have a change of scenery.
Ideally get a job like Wander's where he has to travel internationally for work a lot. Then you can take the girl with you as she pretends to be a stranger on the same flight for cover until you arrive in your desired destination.