In the winter the end of the quai of the Bain des paquis is mostly dedictaed to Hammam/Sauna, there are 2 Hammam rooms, one mixed one female, (which stay open all year) but the highlight is the steam room which has a glass front which looks out over the lake to the alps. The whole thing is set out along the end of the quai and whilst there is the cold shower option jumping in the lake is amazing!
The whole trip costs about 12 francs I believe and you get a lockable changing room which you can keep your stuff in. read more