It's about a 15-20 minute drive from Queenstown; they can also pick you up in town for free if you don't have a car. You get to this place in the mountains where the staff are friendly and the atmosphere relaxed and are taken to your own private room (you get it for an hour and can extend for longer). There's a private shower inside, a wooden hot tub with jets that massage and relax the muscles, a glass wall that you can leave closed or open up, and views of the mountains and roaring river below.
Chris and I went in the wintertime when the air was crisp and the hot tub was the perfect temperature to keep you warm even with the rooftop opened.
And again in the summertime when everything was green and in bloom. You can also add a jet of cold water if you start overheating which we used a few times. I much prefer going in the summer because I think the views are better, but then again if you go during a snow storm I'm sure the winter views would be just as beautiful.
prices on their website. It might be a little lonely going alone (unless you really need to get away from the world, then it's perfect), but it's really a perfect activity for a group of people (a going away party? or a date night?). I highly recommend it.