The most typical and traditional way to enjoy Finnish nature is to spend a night in a tent. Setting up a tent is allowed pretty much anywhere in a forest or a beach, even privately owned areas but do follow the Everyman's Rights (and rules). In national parks, areas meant for over-night stays are separately marked.
When setting up a tent in a natural environment, it is good to keep a few things in mind. Look for an even spot of land, preferably in the shade. Bring enough water, food, and clothes for the length of your stay. Wearing separate layers of clothing is a smart idea; in the summer, day temperatures can range from +15 Celsius to +30 depending on where in Finland you are. Winter camping is recommended only with an experienced guide, especially for beginners. Read more about winter camping gear at Nationalparks.fi.
If you’re looking for something in-between – getting the experience of sleeping outside but looking for some amenities – you might want to consider staying at a camping site. Camping sites in Finland usually provide visitors the chance to use a kitchen, shower, sauna, and electricity. Camping sites often offer a place for your tent – around 15 euros per night depending on the season and location – or the possibility to rent a humble cabin. To secure a spot, contact the camping site ahead of time, especially in the summertime when the high season is on. Read more about camping sites at Camping.fi.