Winter swimming in Finland by Visit Finland via Flickr. (I've done it and it's...shocking! Same with lying down in the snow. After a hot sauna, though, it's hard to differentiate between hot & cold, I've found.) :)
Sailing in Turku Archipelago by Visit Finland, via Flickr - Finland has, depending on the method used, somewhere between 55,000 and 188,000 lakes, and nearly 3000 miles (4830 km) of coastline, off which lie more than 80,000 islands including the Åland archipelago. Cruising opportunities are infinite, either through the many islands or on the lakes, the larger of which are navigable.