An alternative to carrying a walking stick as a poking device is to carry a retractable lecture pointer. It closely resembles a car's radio antenna. But it has a slightly sturdier construction. So it is good for pushing the poison oak, etc out of the way.
When retracted, the pointer I bought from Staples for a little under $5 is no larger than a pen and only slightly more heavy. The pointer is roughly 3-feet long when fully extended. Rectractable pointers aren't just easier to carry. They also are less conspicuous during urban caching. They are easy to transport and muggles find them completely non-threatening.
Another great safety device is an LED flashlight. I've been quite happy with a 5-inch metal flashlight I bought at Lowes. It was not cheap. But it helps me all the time. The high power rating is essential because no mere maglite flashlight sufficiently illuminates a dark hole peered into it through the glare of a sunny summer afternoon. Spending the extra money for an LED instead of a conventional flashlight is also a good idea. The batteries of my LED flashlight last forever. A comparable conventional flashlight would have gone through many batteries during the same period. I commonly use my flashlight during the daytime to inspect the holes before I start poking with my pointer or probing with my hands. I've avoided countless black widows and wasp nests in sheds and holes as well as under bridges with this flashlight. I'm sure everyone will agree a they can inspect these dark spots more thoroughly visually than when they blindly probe with a sticks or fingers.
Other great reasons to carry always flash lights:
1. Flashlights allow you stay on the trail if you find yourself returning from a cache on a dark night. Many shady forest trails becomes pitch black at night. Bumbling down a set of switch backs at night on an unlit trail without a flash light courts disaster.
2. Flashlights double as bike lights
3. Even small flash lights can be just as persuasive at deterring assaults from potential evil doers as walking sticks--although I rely more on my pleasant disposition (and large frame) than my flashlight in those situations.
4. If the flashlight uses the same type of battery as your GPS, you get an extra level of battery preparedness--except when you need your GPS at the same time you need your flashlight. (Battery redundancy is an argument for also carrying a small digital camera.)