I'm a newly minted geocacher having found my first cache about a week ago. My enthusiasm has apparently been contagious as three friends are now actively involved in the sport. Several of the uninitiated however have scowled and suggested that this could be a potentially unsafe activity. The most often heard objection is fear of booby-traps. As an old time Florida trail rat I've always been wary of mocasins and rattlers and have given gators wide berth, but booby-traps! Is this a valid concern?