You don't have to worry too much about showing too much stealth, but since it is a cemetery, respect should be shown. Nothing less is expected from a geocacher.
No hint is really needed, but you'll be pleasantly surprised at the name on a gravestone near GZ. It's guaranteed you'll be happy you found it!
UPDATE!!!! 02 September 2018 As I was passing by on my way to cycle a section of the PPJ Cycloparc Trail yesterday, I noticed something amiss about the cemetery. Both of the lilac bushes had been cut right down to ground level! I have replaced the cache and placed elsewhere in the cemetery. Hopefully, the new spot won't be destroyed!