Believing in UFOs would be a big stretch for me.
I'm sure there's intelligent life out there somewhere, but I'm with JLar regarding the difficulty of interstellar travel.
Also, if we are visited so often, why don't they actually land their craft and try to make contact?
The scenario of an earth sightseeing interstellar trip is really far fetched.
If we are ever visited, I hope they can pick up some of the radio signals from some of our poster's radio shows: "Hmm, what are these delightful sounds they call jazz?"
B)