Follow that boat!

Nikon D5100, 35mm, 1/200s @ f/6.3, iso 100

This time it's the nature, not people, that is the main subject of the picture. 

Even though the vignetting draws an eye to the small motorboat in the centre, if you follow its path you'll reach hills of Taquile Island on the horizon. And you may be surprised that the bright white cloud on the horizon is indeed Cordillera Real, part of Bolivian Andes with peaks above 6,000 m.