This is quite a long trek and is the last cache on the hiking trail that I placed. You've seen Irish bogland at its finest. You are probably wet, muddy and tired but you did it!
Follow the track to the end, passing through 2 gates. Please close them after you. This brings you back on to the main road.
Unless you left someone behind with the car you still have to trek back to where you parked, or turn around and re-trace your steps back to the beginning again.
The choice is yours.
Incidentally, I cycled this on my mountain bike to place these caches and fell off in the mud and water so it was a trek for me too.....Twice!
You are looking for a white cylindrical container about 80mm long and 50mm diameter.