Sønderborg Lystbådehavn (Sønderborg Lystbådehavn amba)

Sønderborg Lystbådehavn sits at the southern entrance of Als Sound, with room for 600 boats — including 120 guest berths — right alongside a sandy beach. The setting is hard to beat: solid supply, disposal, bath, and toilet facilities on-site, and the city center is just a 15-minute walk away.