What is Thalassotherapy?
Rather than try and explain, you can have a look here to find out what it is and here for the Gloria Palace website. And you can expect another post in May telling you whether it was any good!

Photo by G@bry
Actually I had some treatments at the Gloria Palace San Agustín hotel (same chain) a few years back. I had a massage, algae treatment and some kind of wrap, then half a day in the spa pool. It was pretty good and you do come out feeling nice and relaxed.
I really love stuff like that but it doesn't come cheap unfortunately! I've only ever had 2 massages - one in Gloria Palace San Agustín and one in Holiday World in Maspalomas (the Wellness Centre part not the rollercoaster part!) and I really liked them.