Head West.

A waterfall means there may likely also be a cave not too far from it, and that could be a place to set up a shelter. Of course, if there are other mythical beast out there, it'd make a nice home for them too. Even knowing that, you head westward anyway. There is no path to follow really, but by listening closely, you're able to keep in the right direction. You have to cross some wild lands, downed logs and vines galore, but soon you reach the spewing water.