The discounts are similar to the Disney Visa. 10% off a $50 purchase in the shops, 10% off non-discounted photo packages, for the spa--20% off massage/facials while in a port.
Make sure you have your DVC member card with you for any discounts!
There are some freebies for DVC members--there is a DVC Members celebration either on boarding day or the first full day with raffles, free champagne/mimosas/non-alcoholic sparkling cider/bottled water. You can also go to the DVC desk on board and get various freebies throughout the cruise. You should get a DVC member magnet on your door, and a phone call around 1-2 weeks before the cruise about when the DVC member celebration will take place.
Here are some of the freebies we got on our 1 week Disney Wonder Alaskan cruise in August 2016:
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