I made a beautiful lake where the river flows to. A calm and relaxing place where you can build your base, go for a swim and go fishing (future feature) too. Some colourful flowers makes it more picturesque.
The river is looking pretty nice with frothy foam. You can float logs and other junk all the way from upstream, but it tends to get stuck at the edges however. Haven't made a boat yet, but I suspect it will suffer the same fate unless it's player controlled.