This place doesn't need my 56th review singing it's praises but I'm reviewing it anyways.
The Qua Spa was total heaven. It's gendered separated but that's ok. On the women's side we had 3 different roman baths (mineral water) of all different temperatures (the back two - hot and cold - have waterfalls behind them), a jacuzzi (the only chlorinated water), herbal steam room (Seriously, this cured the cold I had), cedarwood sauna (very dry heat, lovely scent), arctic ice room, tea room, fully stocked vanity area (hair dryers, curling irons, flat irons, deodorant, gel, hairspray, baby powder), and awesome showers. Lush towels and water everywhere.
The place was dead when I went in (10AM) so I had it to myself practically until it started to get busier at about 11AM.
The staff here is very nice, non-intrusive, and totally accommodating. When you walk in they set you up with a locker equipped with a lush bathrobe and ask your shoe size for their super comfy sandals.
The best thing - a day pass for everything I described is $45. You can even leave and come back if you wanted!
I would go back here anytime and recommend it to everyone.