Söderskär lighthouse island combines a rugged but breathakingly beautiful environment with a fascinating history. In summer there are cruises to the island for the public, and for groups there is the possibility of chartering a cruise. During your visit you will hear many fascinating stories and also visit the art exhibition, which changes every summer. You can book accommodation in the lighthouse from July to September.
http://www.discoveringfinland.com/destination/soederskaer-lighthouse/