The Trosa archipelago is another exceptional place to explore, usually quieter than the Sockholm archipelago. It is certainly much smaller in size and number of islands, but it offers it all in a week, from the historical Trosa and Oxelösund cities, through the protected coves of Aspöflädden or Rinsön, as well as the open sea ride to Hävringe. Worth a full week, if not even more.
This itinerary is circular. Therefore, the starting point as no particular importance. Coming from the south, you will start in Oxelösund while coming frmo the north you should start with Landort or Ankarudden.
This one week itinerary from Södertälje to Trosa.