In Finnish summer the biggest and one of the best things is to go to the summer cottage. There we spent weekends and hopefully weeks of our summer. Especially midsummer is the time when everyone goes to the cottage. And because of that, all the cities gets empty. Usually Finnish cottages are by some kind of water. And there is not that much ”modern” comfort as we have in our homes. This also depends whose cottage it is. Some people make it modern and some make it more oldish (without electricity etc.)
What to do in the cottage then? Just chill, drink, eat grilled food and go to sauna and swim in the lake. It is a place to spend peaceful holiday with friends and family (usually with friends it goes more partying than just chilling).
I think one of the important things in cottages are that they have to be ”in the middle of nowhere” further away from the cities. In the nature where is silent. Finnish summer is one of the most beautiful things what we have. And even better if it’s warm and not snowing.