For 3 days, launch at Rockland or Rockport. You should be able to get a few days parking. Then sail East to the Fox Islands, 10 NM, and spend a few days between (Fox Island Thoroughfare, which is like a sound) and sailing around these islands. There are several well protected anchorages around the perimeters of the islands and facilities in major stops like North Haven (moorings, bathrooms, provisions, fuel, etc.) If you feel adventurous and have time, head another 10 miles East for another world to explore around Stonington.