A place to park, but only for one car(just about), relax and solve the puzzle.
Then using your complete grid, let the top left hand corner be A1. The cache can be found at:
N 54 A3(E8-6).H3B6G4 W 004 C9E1.H8B5F5
The cache container is now much smaller and only contains a logbook. No special FTF prize but there is a Travel Bug to pick up.
Check your solution at GeoChecker.com