I had to cancel a
Disneyland Paris parks and hotel package a few years ago. I had paid in full and I think I just got 30% of the cost back. I know I lost money.
If you have to cancel for a legitimate reason, ie you cancel your entire vacation to Europe for a medical reason or the death of a family member for example, you can submit documentation to your
travel insurance. If you just cancel because you change your mind about going you will lose money