Boats run from Färjkajen quay in the harbour, southwest of the train station, to a string of small islands in Lake Mälaren blessed with great beaches.
The closest is Östra Holmen, which is noted for its three excellent nudist beaches on the southern shore. It’s popular with locals who come here to enjoy the wide open views of Lake Mälaren and to explore the island’s undisturbed shoreline – an easy circular walk of around 2km.
Further south, much larger Ridön traces its history back to Viking times, and is today a peaceful forested haven, with sheltered coves ideal for swimming. A country lane winds across the centre of the island from west to east; there’s a small café and wooden bell tower at the point where this lane meets the path leading up from the ferry jetty.
Two other uninhabited islands, Almö-Lindö and tiny Skåpholmen, are perfect for seekers of total solitude. Almö-Lindö, which the boat reaches first, is the better bet since it’s larger, has more varied terrain and some good swimming beaches – though no facilities. Skåpholmen is a skinny sliver of an island, again with no facilities.
Detailed ferry times can be found at wrederimalarstaden.se but generally boats sail several times daily between late April and early November.