Poison Ivy: It is everywhere around here. I am convinced that many caches are placed in the winter when the poison ivy is not leafed out all over the place.
Creepy/Dangerous People: Haven't had it happen yet - but there are caches I won't go after by myself because I am unfamiliar with the area. There was a guy a couple of days ago that I thought might be another geocacher waiting his turn - but he was just watching a very large fish a pond.
Cops: I'm glad others have this fear...
Getting Seriously Hurt: Recently I've been looking for caches between errands or appointments. No one knows when I go searching for a cache or even where I might be.
Wet Hen