I'm a neeeeewbie, and I have only one cache of my own. However, the day after I placed my cache at a popular mountain bike trail, I was riding there and I passed two hikers on different parts of the trail. To see hikers and dog walkers is common, but the daypacks seemed out of place... When I got back to my car, there were two other cars in the parking lot, and they each had some form of geocaching symbol. The next day, I checked my cache's log, and there were two entries..... (!)