Finland has population of 5.3 million and about 2 million saunas! Sompasauna is a Finnish sauna in Helsinki, run by volunteers and being ILLEGAL at first! Not any more though! Now the place even has a website- www.sompasauna.fi Learn more about this interesting place- Sompasauna (the Ghetto Sauna).
Couchsurfing experience is a great way to connect with the locals of the destination you are travelling to: food, drinks, public transport, friends.. you may benefit a lot from Couchsurfing.