Your passes are transferable, but if you are considereing a WDW trip in the future I would hold off on using them for DL. I've never done it, but I hear you actually lose money in the long run.
I would stay at DL for three days, maybe four if you're going during a peak time. Try and get down to San Diego if you can. We have the World Famous San Diego Zoo, Sea World, and the Wild Animal Park. Have fun planning!!!
Melissa