Where on Earth is the most windless lake with its own micro climate sea breeze? Would a circular lake have enough of sea breeze strong to create a gentle vortex in the center of the lake? Is there such a place on Earth where lake micro climate vortexes occur frequently? 
The Vortex would still be a breeze and not visible during normal Lake Breeze conditions.

https://worldbuilding.stackexchange.com/questions/108896/could-a-city-be-built-out-of-balloons

Where is the calmest place on Earth?
Wind Vortex on a Lake: the only thing I can visualize is a Tornado on a Lake.

Examples: Pine Lake tornado, Lake of the prairies Tornado

Technically speaking, a breeze/wind cannot be contained within a Lake, unless the lake is covered by mountain-cliffs or canyons at all sides. Maybe something like Marietas Island's hidden beach or Melissani Cave, but much larger would sustain a self contained breeze.