old post, but in case anyone still arrives here, i have tried Golden Sauna last weekend. It is a mens spa, mostly for massage and I guess sex, but you dont need to take any of these services. The price was 400hkd, for using the spa for 12 hours (or 550 for 24 hours and 90 minutes massage). It has showers, a hot water bathtube, dry sauna, and some rooms for sleeping. It was very crowded on Saturday, so not very comfortable for sleeping, but still ok.
And it has free food (meals, drinks and brekfast).
It was a funny experience for one night.