We have a whole day to explore the Stockholm Archipelago. We would like a combination of nature with a biking opportunity and also a visit to a town with some history or quaint buildings. Which islands? We are considering Grinda and/or Svartso. And Vaxholm or Sandhamm. So the question is how many areas can we reasonably do and how do we book passages to them.? Which carrier will let us plan our own itinerary?