The cache is not at the posted coordinates so don’t waste your time going there!
You can find the location of the cache by reading on…

A man was out walking through the woods and he discovered an interesting tree. As he stood there admiring it, he began to contemplate how tall it was. He tried to work it out and started off by noting down some measurements based on what he could see. It then started to rain so he ran for cover to the nearby café where he could sit down with a nice brew and a slice of lemon drizzle cake to finish off the calculations. Unfortunately the rain had spoilt the piece of paper the measurements were written down on and all he could make out from his scribblings were 2 things:
The distance from his eye to the base of the tree was 51.32m, and the angle from his eye level to the top of the tree was 42.44°.
He then measured his eye level to be 1.8m from the ground and realised that he had enough information to be able to work out how tall the tree was.
If the distance from his eye to the top of the tree was AB.Cm, and the total height of the tree is DE.Fm, then the cache can be found at N51 48.ABC W000 46.DEF and it is hidden in a tree!
You can check your solution to the puzzle here:

WARNING:
Neither myself or Groundspeak accept responsibility for any injury caused while Geocaching. It is your responsibility and yours alone to assess whether you have the necessary skill and ability to reach this cache. If you don't feel comfortable then walk away and perhaps return another day when you are more prepared. A smiley is really not worth risking a serious injury over is it?!