Not really a question but FYI: there is a great little boat rental shop just north of the ferry boat dock in Varenna. He is fair (no charge for fuel) and let us have the boat for nearly 6 hours and only charged us for 4 (200 E). Great way to see the whole lake, stop and swim anywhere you want, stop for lunch or drinks at any of the small towns lining the lake and sightseeing (George Clooneys place is awesome but others make it look like a camping tent).
If you can drive a car, you can drive this boat. Very easy.