Wrong way on a bike lane?
In general, if a bike path (lane) is on a road, follow the direction of traffic on that road. If there isn't a bike path on the other side, then bike carefully in the road if permitted, or find a different route. 

If a bike path is separated from the road and there aren't directional signs, stay to the appropriate side of the bike path depending on where in the world you are (right for most of the world, left for fans of the queen typically). If there are bike paths on both sides of a road, use the direction of the closest bit of road. 

Do not go the opposite direction of what is marked!

(*) In the original post, there was an arrow indicating what direction traffic on the bike path was to go; in this case, it should be obvious -- follow the marked direction.