The starting coordinates will put you in a place that will be teeming with muggles around Back to School time. If, when you get there, this is the case then you may want to look for the final later.
From the starting coordinates, look north and ponder this riddle:
Most have one, I have two. But I was never first.
The final cache is a micro so BYOP. Come back later if there are muggles about and please do not visit late at night! Maximum stealth is essential!