Lago di Braies is a beautiful lake where I haven't been yet. I want to visit South Tyrol next year and maybe this lake too.
If you don't want to feel like in a subway at rush hour you should be there as early in the morning as possible, because there will be thousands of tourists during the day. This is, why I haven't been there yet, but I know some people, who were ;) It is a very, very beautiful lake though, just as the rest of South Tyrol.
!BEER