Here this may help to ask yourself these questions while hunting.
Why is that there?
Does that look natural?
Look for stumps, holes, and under rocks. A Marker would be a area to look, remember that cache owners have to find them too. Just some stuff to think about. One last thing keep practicing with your GPS you will get a better understanding of how it works. Just because it says 5 feet doesn't mean that is exact, GPS units have a 10m (30 feet) accuracy so depending on the weather and who hid it are all factors that you may have to work with.
Have Fun that is the most important part.
I have friends in overalls whose friendship I would not swap for the favor of the kings of the world.
Thomas A. Edison