The posted coordinates for this mystery cache are for the start of the Adventure Lab with recommended parking near by. There is nothing to find here for either this bonus cache or the adventure lab cache but it is a good starting point for the the Adventure Lab. The final location can be found from numbers revealed in each stage of the adventure lab. Once all the numbers are known, the final location can be found at:
N34 1A.BCD W118 3E.CBD
As always becareful where you reach and step.
You can validate your puzzle solution with certitude.