You can never make a mistake by placing a tripod near the water and creating a long exposure photo…
Here’s my entry for this week’s #longexposurephotography contest hosted by 
Nikon D750 / ISO 50 / 30s / f11 / Samyang 24mm f1.4
The image was taken in a beautiful hiking area near the town Skrad, in Croatia.
Cheers,
Nino.