If you want to stay overnight in Blå Jungfrun National Park, you can book one of the shelters at Sikhamn. You can book one night at a time for up to eight people. Bookings are made through Solkustturer, who charge a booking fee. The overnight stay itself is free of charge. 

Overnight stay on Blå Jungfrun (solkustturer.se) 

It is not allowed to spend the night anywhere other than the shelters on Blå Jungfrun, including in a tent or under the open sky.

Important information

It is important to note that boat trips to Blå Jungfrun are dependent on weather conditions. This means that you may not be able to travel to the island on your booked day. The weather also determines which harbour the tour boat will use. Because of this, you need to be prepared to carry your luggage over uneven and hilly terrain. 

For safety reasons, you must bring enough food and drinking water for an extra day in case the weather makes it impossible to return as planned.