I got an offer for a free cruise?

It's an offer for a free cruise and airfare if I attend a 90 minute sale pitch bullshit. Is it worth it? I won't be purchasing whatever they are peddling but will I still get my cruise? They said I will walk out of the presentation with the vouchers with no purchase necessary but I don't believe it. Is it going to be a really shitty cruise? I guess I don't care, as long as it's free, I'm a college student and I want to go on a cruise! Anyone ever done this or been on a free cruise like this?