I've been thinking about this topic since it was posted. I usually prefer to photograph alone, but when others are involved, who they are, and how many there are is critical. I've had excellent outings shooting with my wife, and with one or several other people, but what's made then happy occasions is that they've always been alone-together experiences where others respected the autonomy of seeing and making the exposure. OTOH, I can't even imagine tolerating the kind of stereotypical 'photo tour' that has a mass of folks pointing their auto-everything SLRs at the same subject and firing away like a gaggle of paparazzi.