Populating forms in MMEX (Mail EX)

Hi everyone, apparently I've come across a situation which should be simple, but I'm not sure where to start. I've configured a mailing script (MMEX) on my site and all work just fine. But what I can't figure out is how to prepopulate my registration form. On this page http://www.canadiantravelnews.com/ under the Xmas blowout I've got the form setup, but it's ugly, I don't the user to have to enter all this data for this specific trip, I want to use hidden fields to populate my form here http://www.canadiantravelnews.com/booking.php were as many fields as possible are populated, the user then just has to fill in their name and email/phone and hit submit, once submitted it gets emailed to us. Does anyone have any tutorials or examples for this? I just don't know where to start. Appreciate any help people.