WARNING!: YOU HAVE ONLY 3 DAYS TO QUIT. I found this out the hard way. Fortunately after much arguing with customer service, I received a call from a very understanding rep named Judy cancelled my account for me.
That being said, if you take a lot of vacations and like resorts over say renting a house or condo, this could save you money. I would not expect to save enough on a vacation to pay for a second. Rather, if you were going to take a resort vacation anyway, you could knock off some of the cost or pay the same for a nicer accommodation.