Swimming in Iceland is "a must" during your stay. Icelanders love their spas - swimming-pools and hot pots. You will definitely have to visit at least one spa!
Swimming pools in every Icelandic town
Reykjavík has many swimming pools/thermal pools (swimming pool = sundlaug) which are heated entirely by subterranean thermal water and their various hot pots (at different temperatures) offer guests a relaxing atmosphere. In fact, every town in Iceland boasts of a swimming pool, indoor or outdoor, often with special sauna rooms.
"Meetings" in the hot pots (hot tubs)
In the hot pots (hot tubs) people of all ages meet and often there are lively discussions there about politics or other interesting topics! Especially among people who happen to go more or less every day at the same time.
The very best thing to do when it rains or snows, is to head for one of the outdoor swimming pools and coddle yourself in a blanket of steam in a hot pot while the cold rain or snow drips on your face... Try it!
Swimming pools in Reykjavik
One thing not expensive in Iceland is swimming. It’s a luxury for almost no money at all. I suggest you try various swimming pools in Reykjavik e.g. Árbæjarlaug is fabulous for kids and families with big slides and also an indoor pool.
Seltjarnarneslaug uses seawater which means less chlorine and Laugardalslaug is a fantastic swimming pool for all ages, competition sized, with comfortable hot pots for both children and adults. Kopavogslaug is my personal favorite - not too big but very cozy.

