This multi cache is a creative one, you will require a bit of brain power and good observation skills.
The posted co ordinates will take you to an interesting area next to a very unusual structure that doesn't really seem to have a purpose, exept for now...
Once you get to the posted co-ordinates you will be required to fill in the missing spaces by observing your surroundings and filling in the blanks.
Here is how to do so:
S 37 3A.12B E 145 03.5CD
A= Number of green logs
B= Number of nearby wooden seats
C= Number of nearby toilets
D= Number of tunnels nearby
Once the missing co-ordinate numbers have been filled in you can locate the cache.
Have Fun