Run through rivers:
If you are crossing a river, lake, or other body of water and can
see to the other side (where you are trying to get to), make sure
you are out of water near the edge. Then, click on a slightly higher
point of which you are standing, on the other side.
If it works you will swim across without the negative effects of
being in water, such as slower speed and limited oxygen.
Note: Do not click again while in the water.