I would like to reiterate another previous post. If you are asked for papers, signatures, or anything that seems remotely of human requirements, I would NOT go (no matter how tempting). On another thread, it was posted- 'Would you get into the vehicle of a stranger?' Just use common sense. Also, don't forget about the return. What would you do if you saw the MIB waiting for you on your doorstep? Don't take candy from strangers.
Just out of curiosity, what would one bring on a trip like this anyway? What is the driving motivation for going? Are you bringing back proof (remember what happens to proof- many times it is ripped to shreds by debunkers). I personally like the recording devise used by jodi foster in Contact. 18 hours of static for what seemed to be instantaneous time on earth. What would you talk about? What questions do you have?