Go to the posted coordinates... you will find x amount of objects that don't fit into the environment or the park as it is a fairly modern park and I doubt anyone uses these. Now do some simple math to get to the final.
073 - (7x+3) = The new 3 digits after the decimal for the North side
932 - (13x+3) = The new 3 digits after the decimal for the West side
I wouldn't tecomend going from posted coordinates to the final. I went out and around past the coordinates down the creek and back towards the final. Difficulty is for the final. Not sure if it is going to be as hard as I think it is. If it isn't let me know and I will lower it.
Good luck and Happy Caching!