You want to find a spawner? Or hidden chests from a treasure map? You just want to have a little hint?
To do so I suggest the tool PyBlock (for Linux and Mac):
It is easy to use.First you install it on the command line via:
git clone [email protected]:alex4200/PyBlock.git
pip install .
and then you can list e.g. all blocks around you
mcblock --coords 1100 63 -450 --radius 20 --list
or you can find the exact coordinates of some special block
mcblock --coords 1100 63 -450 --radius 20 --find chest
More possibilities see documentation.