I ♥ Sauna
Moving from Arizona desert to East-Central European winter has made my body crave HEAT. Luckily for me, there are spas (geothermal and otherwise) all over
Slovakia, including
Zitny ostrov, and the
Czech Republic. My local spot is in the basement of a hotel tucked into one of Bratislava's communist bloc concrete jungles.
An unlikely oasis, at 6e per hour it's a bargain indulgence. Clothes are optional, regular visits to the water cooler are wise. Afterwards you will glow for days. Other side effects include a happy brain, one that has good ideas.
Obviously, don't forget these.