Also national decisions have been taken to protect Suomenlinna. The Governing Body of Suomenlinna is responsible for the repair, upkeep, and development of the fortress. The National Board of Antiquities has the responsibility for its historical supervision and research. Any nuisance committed to the buildings, the fortress constructions or nature is subject to punishment. In Suomenlinna there are dangerous cliffs which are not completely fenced.
Visitors are in the area at their own risk.
Parents are advised to keep an eye on their children. Admittance to the building sites is refused. There is a regular ferry-boat connection to Suomenlinna all year round. The ferry-boats leave from the Market Square all day long. There is an additional service boat from Katajanokka.