Where to sleep
We spent the first night in the Björno nature reserve. There are several places on the island that are signposted as (free) campsites. There are also outhouses and a few water points (caution: no drinking water!). Luckily, we used a map in the parking lot to find a nice campsite in the middle of the forest and were completely alone there. We pitched our tent so that we had a wonderful view of the sea. We heard some animal noises at night. However, it wasn't scary or anything, but rather very relaxing, so we quickly fell into a deep sleep. The parking lot at the nature reserve cost SEK 45 for 24 hours. A small fee when you consider that we spent the night here and even had a beach in front of us.
The Klubbensborg campsite is closer to Stockholm's city center than Björnö. That's why we spent two more nights here. Overall, the campsite was very nice and well equipped. Booking was also very easy. We paid the equivalent of EUR 33 per night for a pitch with electricity. You can also rent a room in the Klubbenborg guesthouse of the same name. There is also a café and a marina. The Klubbenborg site is located directly on the water and is only a 10-minute walk from the nearest subway station. We bought a day ticket for Stockholm for around 12.50 EUR per person and took the metro to Mariatorget, from where we started our day in Stockholm.