I get theraputic massages all the time - they're anything but relaxing, so I'd stay away from the deep tissue massage unless you have some serious muscle problems to get worked out. If you do get a deep tissue massage, be prepared to "relax through the pain" and drink LOTS of water afterwards. Massages release toxins into your muscles, which is what makes them ache after a deep massage.
Besides that, my most memorable spa experience was a very pleasant banana wrap at the Hotel Intercontinental in Moorea, Tahiti. It made my skin very soft and banana-scented, which Mr RedRose enjoyed.