CACHE IS NOT AT THE POSTED COORDINATES!!!
That said, here's a few notes:
~ The cache is indeed in Cave Hollow Park, you will not need to go
anywhere near 50 Highway.
~ LOL @ the GC code... can you NET this Red Herring?
~ Also, I HIGHLY recommend checking your coords 
Red Herring (idiom)
Defined as a deliberate attempt to divert attention
Red Herring (logical fallacy)
deliberate attempt to change a subject
or to divert an argument
Red Herring
No such fish exists
A Kipper (fish) cured in brine or heavily smoked
will turn red!
The idiom is old.
It dates to circa 1400
"He eteþ no ffyssh But heryng red."
Samuel Pepys also used it in February 1660
The End
You can check your answers for this puzzle on
Geochecker.com.
Gur dhvpx oebja sbm whzcf bire gur ynml qbt.