Rivers are kind of dull and fairly small. Would be interesting to either see mutiple types of rivers, perhaps including large ones with more powerful waterflow. Bears could be prevelant at these rivers, and fish too. This could allow players to raft from one point of the map to another through the mainland, even allowing new PvP tacticts. Another great addition would be large waterfalls falling from rivers and into small lakes. These could be populated by animals who could drink from it if an added animation sounds worthwhile.