When I was in college I fell victim to one of these scams that I got in the mail in the form of a post card and 888 number. Luckily my Amex took care of it for me.
I wouldn't trust them. HOWEVER>>> It is possible to get a vacation for free. I am going to Vegas for Memorial Day weekend and it isn't costing me a thing. (Until I gamble of course
I got an e-mail about it from the official Caesar's website and the phone number was actually for Caesar's Hotel. I get 2 nights deluxe accomidations as well as 2 passes to the spa and a 50.0- credit to one of the restaurants.
I would go with my instincts on things like this. Usually if it's too good to be true...
PrncsNYC