I most definetly cache alone. Most of my friends think that its a silly pastime. I have taken a couple of friends once, and they liked it, but not enough to go a second time. Anyway, I really like caching alone mostly because I talk all day long to many many people (retail) so time alone with my thoughts is most enjoyable!
I do wonder if muggles think I am up to no good, or if they will find the cache and destroy it, but the joy of the find makes me forget all of that!
BTW, i do wear a hat...to cover the bald spot!