Kökar has three guest harbours, in summer filled with boats from all around the world. Kökar is a familiar name as far as in Australia and New Zeeland.
Close to the ferry berth and Hamnö with the church and monastery ruins, there is Sandvik Marina . The harbour can accommodate 50 boats. The guest harbour was voted to be The Guest Harbour of the Year 2016 in Finland.
In Karlby, next to the hotel and restaurant Brudhäll and only a short distance from bank, post office and grocery store, there is Karlby guest harbour. There is a playground nearby. The guest harbour can accommodate 60 boats.
In Hellsö, by the restaurant Havspaviljongen, there is Hellsö guest harbour with room for 50 boats. By the harbour there is a sauna by the beach, grocery kiosk also selling fuel and a mini golf course. You can visit the Kökar museum nearby.