Hellasgården

A must for an authentic local experience. We went on a Saturday and the crowd was mostly locals enjoying their day off, not touristy at all. The bus ride from Slussen was short, easy, and completely worth it even given the fact we only had one day to spend in Stockholm.
Definitely the most relaxing/​refreshing experience I had in Stockholm. The water was 4 C and it had snowed the night before, which didn’t stop me from going in at least four times. The temperature inside was about 82C so it didn’t take long to feel like you needed to cool off.
The facilities were all clean and well maintained and the staff was friendly. The price is unbeatable; we considered a (much more expensive) trendier spa-​like place in Ostermalm before coming here and we were very glad we made the choice we did!

This place is AWESOME. My friend was visiting from Madrid and we wanted to have a very Swedish adventure so we went polar bear swimming in the lake in Feb! It was definitely an ADVENTURE, and very exhilarating! The place itself is cool, they have lots of little huts in the complex, a restaurant, a place to rent ice skates, and then a locker room with separate showers and saunas for men and women (nothing fancy, but clean enough!).
Basically, you arrive, change into your swimsuit (or nothing at all, as many people did!) hustle down to the water, hop in for a few seconds, and hustle back to the sauna and spend half an hour getting your body temp back up to normal :) And repeat.
My biggest piece of advice is BRING SANDALS! We didn’t and our feet are suffering from painful frostnip now. Luckily some girls there were super nice and for our second dip, they lent us their flip flops for the icy walk down to the water. It made a HUGE difference.
A bus takes you right from Slussen to Hellasgarden (about a 20 min ride), and it’s only 60kr entrance fee for many hours of entertainment– best deal in Stockholm!
Only drawback is the guy who is working at the cash register where you pay to enter is a real nightmare. But aside from him, it was sweet :)