Book a private cruise including a special guided walking tour of the tunnels and casemates at the Suomenlinna Sea Fortress. The bastion walls hide old tunnels (some of which are closed for the regular public) and you will also see impressive guns as well as the most important sights of the fortress during the tour. After the tour the group will continue on board enjoying refreshing drinks and the delicious food our chef has prepared while the boat cruises in the beautiful archipelago.