Question about free water park tickets promotion

[smelton521]

I just saw where Small World Vacations is offering free water park tickets if you book a new vacation package through them. We already have a package booked and all our ADRs. Is it possible to cancel our vacation package and not lose our ADRs so we can book through SMV and get the free water park tickets? I am assuming we will lose our ADRs once the vacation package is canceled but just wanted to check. This is our first trip to Disney World. Thanks!