A rocky hide...
No need to harm or affect any plants. This place may get busy during the weekends/evenings with kids walking back home from school and the nearby park in the school. Night caching is allowed. BYOP and sign the logbook as proof of find. If for some reason you cannot physically sign the log, send a picture of the log as proof of find to the CO. Make sure to put the cache back into place exactly as it was found.
Good luck, cache on!