Yes, I have. One time I was out geocaching in some woods at a local park and as I was walking along the trail, I found some beer. So I think about CITOing it out, but the park as a no alcoholic rule. So I just left it and go on my way.
Most of the time I go solo, but sometimes I go with my sister or my Mom or my Dad. Sometimes I will go with my friend's as well and having company make's geocaching a hole lot funner.