Hey ! thanks for the question ! :) 

My favourite place to sail or so far is at Lago di Garda (Garda-Lake in Italy) The place and views are just so magnificent!

Also I like the Finnish Archipelago, ofc since I come from Finland I have to mention it but also because its so close to the small islands and stuff but still its not far from the big waves either ! 

Also I have many other good places were I have sailed, its usually for me more important and what makes its special for me is the feeling, weather and the current mindset/moment when I am sailing that makes it special !