Can I take days off a trip on line? I know I can look at other resorts, but I wasn't sure if I could change the dates. Or will they make me cancel and rebook? I have a promo rate I don't want to lose. Should I call?
Is that promotion still available for booking? If so, as long as your new (shorter) dates are available you should be able to change and keep the promotion. If it's no longer bookable, you may have trouble trying to shorten your stay. I'd call.