From Kapellskär's harbor, ferries go to Åland with several trips daily. Viking line calls at Mariehamn and Finnlines has its port in Långnäs.
A very popular excursion is a day cruise with Viking Line to Mariehamn. Those staying at the campsite and hostel have a discount on the trip and free bus transfer to and from the ferry. Discount code for the boat trip is obtained when booking accommodation. Bus transfers are booked upon check-in.
Bookings are made here